Entanglement and magnetic order (2009)
In recent years quantum statistical mechanics have benefited of cultural interchanges with quantum information science. There is a bulk of evidence that quantifying the entanglement allows a fine...
SQUID Detection of Quantized Mechanical Motion (2009)
Pugnetti, Stefano, Blanter, Yaroslav M., Fazio, Rosario
We predict that quantized mechanical motion can be detected by embedding a mechanical resonator into a quantum SQUID. If the system is tuned to the regime when a plasma frequency of the SQUID matches...
Blockade and superdrag in exciton-condensate Josephson junctions (2009)
Dolcini, Fabrizio, Rainis, Diego, Taddei, Fabio, Polini, Marco, Fazio, Rosario, MacDonald, A. H.
Boson and Fermion-pair condensation are the most remarkable phenomena in statistical physics because they promote quantum behaviour from the microscopic to the macroscopic world. In this Letter we...
Patane', Dario, Amico, Luigi, Silva, Alessandro, Fazio, Rosario, Santoro, Giuseppe E.
We study the dynamics of open quantum many-body systems driven across a critical point by quenching an Hamiltonian parameter at a certain velocity. General scaling laws are derived for the density of...
Entanglement of electrons field-emitted from a superconductor (2009)
Yuasa, Kazuya, Facchi, Paolo, Fazio, Rosario, Nakazato, Hiromichi, Ohba, Ichiro, Pascazio, Saverio, ...
Under appropriate circumstances the electrons emitted from a superconducting tip can be entangled. We analyze these nonlocal correlations by studying the coincidences of the field-emitted electrons...
Dipole oscillations of confined lattice bosons in one dimension (2009)
Montangero, Simone, Fazio, Rosario, Zoller, Peter, Pupillo, Guido
We study the dynamics of a non-integrable system comprising interacting cold bosons trapped in an optical lattice in one-dimension by means of exact time-dependent numerical DMRG techniques....
Adiabatic dynamics in a spin-1 chain with uniaxial single-spin anisotropy (2009)
Canovi, Elena, Rossini, Davide, Fazio, Rosario, Santoro, Giuseppe E.
We study the adiabatic quantum dynamics of an anisotropic spin-1 XY chain across a second-order quantum phase transition. The system is driven out of equilibrium by performing a quench on the...
Andreev reflection in graphene nanoribbons (2009)
Rainis, Diego, Taddei, Fabio, Dolcini, Fabrizio, Polini, Marco, Fazio, Rosario
We study Andreev reflection in graphene nanoribbon/superconductor hybrid junctions. By using a tight-binding approach and the scattering formalism we show that finite-size effects lead to notable...
Optimal Control at the Quantum Speed Limit (2009)
Caneva, Tommaso, Murphy, Michael, Calarco, Tommaso, Fazio, Rosario, Montangero, Simone, Giovannetti, Vittorio, ...
Optimal control theory is a promising candidate for a drastic improvement of the performance of quantum information tasks. We explore its ultimate limit in paradigmatic cases, and demonstrate that it...
Probing a composite spin-boson environment (2009)
Oxtoby, Neil P., Rivas, Ángel, Huelga, Susana F., Fazio, Rosario
We consider non-interacting multi-qubit systems as controllable probes of an environment of defects/impurities modelled as a composite spin-boson environment. The spin-boson environment consists of a...
Adiabatic dynamics in a spin-1 chain with uniaxial single-spin anisotropy (2009)
Canovi, Elena, Rossini, Davide, Fazio, Rosario, Santoro, Giuseppe E.
We study the adiabatic quantum dynamics of an anisotropic spin-1 XY chain across a second order quantum phase transition. The system is driven out of equilibrium by performing a quench on the...
Detection of Tiny Mechanical Motion by Means of the Ratchet Effect (2009)
Pugnetti, Stefano, Blanter, Yaroslav M., Dolcini, Fabrizio, Fazio, Rosario
We propose a position detection scheme for a nanoelectromechanical resonator based on the ratchet effect. This scheme has an advantage of being a dc measurement. We consider a three-junction SQUID...
Patanè, Dario, Silva, Alessandro, Amico, Luigi, Fazio, Rosario, Santoro, Giuseppe E.
We study the dynamics of open quantum many-body systems driven across a critical point by quenching an Hamiltonian parameter at a certain velocity. General scaling laws are derived for the density of...
The quantum optical Josephson interferometer (2008)
Gerace, Dario, Tureci, Hakan E., Imamoglu, A., Giovannetti, Vittorio, Fazio, Rosario
The interplay between coherent tunnel coupling and on-site interactions in dissipation-free bosonic systems has lead to many spectacular observations, ranging from the demonstration of number-phase...
Optimized single-qubit gates for Josephson phase qubits (2008)
Safaei, Shabnam, Montangero, Simone, Taddei, Fabio, Fazio, Rosario
In a Josephson phase qubit the coherent manipulations of the computational states are achieved by modulating an applied ac current, typically in the microwave range. In this work we show that it is...
Nonlocality of Field-Emitted Electrons from a Superconductor (2008)
Yuasa, Kazuya, Facchi, Paolo, Fazio, Rosario, Nakazato, Hiromichi, Ohba, Ichiro, Pascazio, Saverio, ...
We propose to study entanglement and correlations in a coincidence experiment in the field emission from a superconductor. Electrons emitted in opposite directions exhibit positive correlations...
Adiabatic dynamics in open quantum critical many-body systems (2008)
Patane', Dario, Silva, Alessandro, Amico, Luigi, Fazio, Rosario, Santoro, Giuseppe E.
The purpose of this work is to understand the effect of an external environment on the adiabatic dynamics of a quantum critical system. By means of scaling arguments we derive a general expression...
Dipole oscillations of confined lattice bosons in one dimension (2008)
Montangero, Simone, Fazio, Rosario, Zoller, Peter, Pupillo, Guido
We study the dynamics of a non-integrable system comprising interacting cold bosons trapped in an optical lattice in one-dimension by means of exact time-dependent numerical DMRG techniques....
Adiabatic quantum dynamics of the Lipkin-Meshkov-Glick model (2008)
Caneva, Tommaso, Fazio, Rosario, Santoro, Giuseppe E.
We study the adiabatic dynamics of the Lipkin-Meshkov-Glick (LMG) model close to its quantum critical point by linearly switching the transverse field from an initial large value to zero. We...
Phase-dependent electronic specific heat of mesoscopic Josephson junctions (2008)
Rabani, Hassan, Taddei, Fabio, Bourgeois, Olivier, Fazio, Rosario, Giazotto, Francesco
We study the influence of superconducting correlations on the electronic specific heat in a diffusive superconductor-normal metal-superconductor Josephson junction. We present a description of this...
Urban, Daniel, Koenig, Juergen, Fazio, Rosario
We study the effect of Coulomb interaction on the full counting statistics of an Aharonov-Bohm (AB) interferometer with a single-level quantum dot in one arm in the regime of weak dot-lead and...
Photon and polariton fluctuations in arrays of QED-cavities (2008)
Rossini, Davide, Fazio, Rosario, Santoro, Giuseppe E.
We propose to detect the Mott insulator-superfluid quantum phase transition in an array of coupled cavities by studying the polariton and photon fluctuations in a block of linear dimension M (in...
Fulde-Ferrell-Larkin-Ovchinnikov pairing in one-dimensional optical lattices (2008)
Rizzi, Matteo, Polini, Marco, Cazalilla, Miguel A., Bakhtiari, M.R., Tosi, Mario P., Fazio, Rosario
Spin-polarized attractive Fermi gases in one-dimensional (1D) optical lattices are expected to be remarkably good candidates for the observation of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase....
Bang-bang control of a qubit coupled to a quantum critical spin bath (2008)
Rossini, Davide, Facchi, Paolo, Fazio, Rosario, Florio, Giuseppe, Lidar, Daniel A., Pascazio, Saverio, ...
We analytically and numerically study the effects of pulsed control on the decoherence of a qubit coupled to a quantum spin bath. When the environment is critical, decoherence is faster and we show...
Adiabatic quantum dynamics of the Lipkin-Meshkov-Glick model (2008)
Caneva, Tommaso, Fazio, Rosario, Santoro, Giuseppe E.
The adiabatic quantum evolution of the Lipkin-Meshkov-Glick (LMG) model across its quantum critical point is studied. The dynamics is realized by linearly switching the transverse field from an...
Andreev reflection in graphene nanoribbons (2008)
Rainis, Diego, Taddei, Fabio, Dolcini, Fabrizio, Polini, Marco, Fazio, Rosario
We study Andreev reflection in graphene nanoribbon/superconductor hybrid junctions. By using a tight-binding approach and the scattering formalism we show that finite-size effects lead to notable...
Photon and polariton fluctuations in arrays of QED-cavities (2008)
Rossini, Davide, Fazio, Rosario, Santoro, Giuseppe
We propose to detect the Mott insulator-superfluid quantum phase transition in an array of coupled cavities by studying the polariton and photon fluctuations in a block of linear dimension M (in...
Urban, Daniel, König, Jürgen, Fazio, Rosario
We study the effect of Coulomb interaction on the full counting statistics of an Aharonov-Bohm (AB) interferometer with a single-level quantum dot in one arm in the regime of weak dot-lead and...
Adiabatic quenches through an extended quantum critical region (2008)
Pellegrini, Franco, Montangero, Simone, Santoro, Giuseppe E., Fazio, Rosario
By gradually changing the degree of the anisotropy in an XXZ chain, we study the defect formation in a quantum system that crosses an extended critical region. We discuss two qualitatively different...
Optimized Cooper pair pumps (2008)
Safaei, Shabnam, Montangero, Simone, Taddei, Fabio, Fazio, Rosario
In adiabatic Cooper pair pumps, which are operated by means of gate voltage modulation only, the quantization of the pumped charge during a cycle is limited due to the quantum coherence of the...
Multichannel architecture for electronic quantum Hall interferometry (2008)
Giovannetti, Vittorio, Taddei, Fabio, Frustaglia, Diego, Fazio, Rosario
We propose an architecture for implementing electronic interferometry in quantum Hall bars. It exploits scattering among parallel edge channels. In contrast to previous developments, this one employs...
Entanglement in many-body systems (2008)
Amico, Luigi, Fazio, Rosario, Osterloh, Andreas, Vedral, Vlatko
The recent interest in aspects common to quantum information and condensed matter has prompted a prosperous activity at the border of these disciplines that were far distant until few years ago....
Quantum Billiards in Optical Lattices (2008)
Montangero, Simone, Frustaglia, Diego, Calarco, Tommaso, Fazio, Rosario
We study finite two dimensional spin lattices with definite geometry (spin billiards) demonstrating the display of collective integrable or chaotic dynamics depending on their shape. We show that...
Adiabatic dynamics in open quantum critical many-body systems (2008)
Patanè, Dario, Silva, Alessandro, Amico, Luigi, Fazio, Rosario, Santoro, Giuseppe E.
The purpose of this work is to understand the effect of an external environment on the adiabatic dynamics of a quantum critical system. By means of scaling arguments we derive a general expression...
Geometric effects of noise on Cooper pair pumping (2008)
Brosco, Valentina, Shnirman, Alexander, Fazio, Rosario
Several works investigated the connection between Cooper pair pumping and the geometric and topological properties of the pumping cycle in the parameters space. Recently the predicted connection...
Nonequilibrium pairing instability in ultracold Fermi gases with population imbalance (2008)
Tomadin, Andrea, Polini, Marco, Tosi, Mario P., Fazio, Rosario
We present detailed numerical and analytical investigations of the nonequilibrium dynamics of spin-polarized ultracold Fermi gases following a sudden switching-on of the atom-atom pairing coupling...
Giovannetti, Vittorio, Montangero, Simone, Fazio, Rosario
Tensor networks representations of many-body quantum systems can be described in terms of quantum channels. We focus on channels associated with the Multi-scale Entanglement Renormalization Ansatz...
Bang-Bang control of a qubit coupled to a quantum critical spin bath (2008)
Rossini, Davide, Facchi, Paolo, Fazio, Rosario, Florio, Giuseppe, Lidar, Daniel A., Pascazio, Saverio, ...
We analytically and numerically study the effects of pulsed control on the decoherence of a qubit coupled to a quantum spin bath. When the environment is critical, decoherence is faster and we show...
Adiabatic quenches through an extended quantum critical region (2008)
Pellegrini, Franco, Montangero, Simone, Santoro, Giuseppe E., Fazio, Rosario
By gradually changing the degree of the anisotropy in a XXZ chain we study the defect formation in a quantum system that crosses an extended critical region. We discuss two qualitatively different...
Non-abelian superconducting pumps (2008)
Brosco, Valentina, Fazio, Rosario, Hekking, F.W.J., Joye, Alain
Cooper pair pumping is a coherent process. We derive a general expression for the adiabatic pumped charge in superconducting nanocircuits in the presence of level degeneracy and relate it to...
Landau cooling in metal–semiconductor nanostructures (2008)
Giazotto, Francesco, Taddei, Fabio, Governale, Michele, Fazio, Rosario, Beltram, Fabio
An electron-cooling principle based on Landau quantization is proposed for nanoscale conductor systems. Operation relies on energy-selective electron tunneling into a two-dimensional electron gas in...
Optimized Cooper pair pumps (2008)
Safaei, Shabnam, Montangero, Simone, Taddei, Fabio, Fazio, Rosario
In adiabatic Cooper pair pumps, operated by means of gate voltage modulation only, the quantization of the pumped charge during a cycle is limited due to the quantum coherence of the macroscopic...
Fulde-Ferrell-Larkin-Ovchinnikov superfluidity in one-dimensional optical lattices (2007)
Rizzi, M., Polini, Marco, Cazalilla, M. A., Bakhtiari, M. R., Tosi, M. P., Fazio, Rosario
Spin-polarized attractive Fermi gases in one-dimensional (1D) optical lattices are expected to be remarkably good candidates for the observation of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase....
Giazotto, Francesco, Taddei, Fabio, D'Amico, Pino, Fazio, Rosario, Beltram, Fabio
We analyze the broad range of spin-dependent nonequilibrium transport properties of hybrid systems composed of a normal region tunnel coupled to two superconductors with exchange fields induced by...
dc Josephson effect in metallic single-walled carbon nanotubes (2007)
Pugnetti, Stefano, Dolcini, Fabrizio, Fazio, Rosario
The dc Josephson effect is investigated in a single-walled metallic carbon nanotube connected to two superconducting leads. In particular, by using the Luttinger liquid theory, we analyze the effects...
Quantum Phase Transitions in Josephson Junction Arrays (2007)
In this chapter we review the quantum phase transitions and transport properties of low-capacitance Josephson junction arrays. We will present the models and introduce the relevant topological...
Duality in Josephson Junction Arrays (2007)
Ya. M. Blanter, Rosario Fazio, Gerd Schön
Introduction Since the original work by Kramers and Wannier [1] on the two-dimensional (2D) Ising model, duality has been proven to be a powerful tool in field theory and statistical mechanics [2]....
Mesoscopic Effects In Superconductivity (2007)
this article, W. Belzig, C. Bruder, G. Falci, F. W. J. Hekking, A. Odintsov, J. Siewert, L.L. Sohn, F. K. Wilhelm, and MESOSCOPIC SUPERCONDUCTIVITY 37 N LL w N(w) N N
Anomalous density of states of a Luttinger liquid in contact with a superconductor (2007)
Winkelholz Rosario, Rosario Fazio, Gerd Schon
We study the frequency and space dependence of the local tunneling density of states of a Luttinger liquid (LL) which is connected to a superconductor. This coupling strongly modifies the...
Entanglement entropy dynamics of Heisenberg chains (2007)
De Chiara, Gabriele, Montangero, Simone, Calabrese, Pasquale, Fazio, Rosario
By means of the time-dependent density matrix renormalization group algorithm we study the zero-temperature dynamics of the Von Neumann entropy of a block of spins in a Heisenberg chain after a...
Nonequilibrium pairing instability in ultracold Fermi gases with population imbalance (2007)
Tomadin, Andrea, Polini, Marco, Tosi, M. P., Fazio, Rosario
We present detailed numerical and analytical investigations of the nonequilibrium dynamics of spin-polarized ultracold Fermi gases following a sudden switching-on of the atom-atom pairing coupling...
4e-condensation in a fully frustrated Josephson junction diamond chain (2007)
Rizzi, Matteo, Cataudella, Vittorio, Fazio, Rosario
Fully frustrated one-dimensional diamond Josephson chains have been shown [B. Dou\c{c}ot and J. Vidal, Phys. Rev. Lett. {\bf 88}, 227005 (2002)] to posses a remarkable property: The superfluid phase...
Full Counting Statistics in Strongly Interacting Systems: Non-Markovian Effects (2007)
Braggio, Alessandro, Koenig, Juergen, Fazio, Rosario
We present a theory of full counting statistics for electron transport through interacting electron systems with non-Markovian dynamics. We illustrate our approach for transport through a...
Mott-insulating and glassy phases of polaritons in 1D arrays of coupled cavities (2007)
Rossini, Davide, Fazio, Rosario
By means of analytical and numerical methods we analyze the phase diagram of polaritons in one-dimensional coupled cavities. We locate the phase boundary, discuss the behavior of the polariton...
Robust optimal quantum gates for Josephson charge qubits (2007)
Montangero, Simone, Calarco, Tommaso, Fazio, Rosario
Quantum optimal control theory allows to design accurate quantum gates. We employ it to design high-fidelity two-bit gates for Josephson charge qubits in the presence of both leakage and noise. Our...
Quantum vortices in optical lattices (2007)
Vignolo, Patrizia, Fazio, Rosario, Tosi, Mario P.
A vortex in a superfluid gas inside an optical lattice can behave as a massive particle moving in a periodic potential and exhibiting quantum properties. In this Letter we discuss these properties...
Bound entanglement in the XY model (2007)
Patane', Dario, Fazio, Rosario, Amico, Luigi
We study the multi-spin entanglement for the 1D anisotropic XY model concentrating on the simplest case of three-spin entanglement. As compared to the pairwise entanglement, three-party quantum...
Adiabatic quantum dynamics of a random Ising chain across its quantum critical point (2007)
Caneva, Tommaso, Fazio, Rosario, Santoro, Giuseppe E.
We present here our study of the adiabatic quantum dynamics of a random Ising chain across its quantum critical point. The model investigated is an Ising chain in a transverse field with disorder...
Robustness of optimal working points for nonadiabatic holonomic quantum computation (2007)
Trullo, Antonio, Facchi, Paolo, Fazio, Rosario, Florio, Giuseppe, Giovannetti, Vittorio, Pascazio, Saverio
Geometric phases are an interesting resource for quantum computation, also in view of their robustness against decoherence effects. We study here the effects of the environment on a class of...
Splettstoesser, Janine, Governale, Michele, Koenig, Juergen, Fazio, Rosario
We present a diagrammatic real-time approach to adiabatic pumping of electrons through interacting quantum dots. Performing a systematic perturbation expansion in the tunnel-coupling strength, we...
Robust gates for holonomic quantum computation (2007)
Florio, Giuseppe, Facchi, Paolo, Fazio, Rosario, Giovannetti, Vittorio, Pascazio, Saverio
Non Abelian geometric phases are attracting increasing interest because of possible experimental application in quantum computation. We study the effects of the environment (modelled as an ensemble...
Crossed Andreev reflection-induced magnetoresistance (2007)
Giazotto, Francesco, Taddei, Fabio, Beltram, Fabio, Fazio, Rosario
We show that very large negative magnetoresistance can be obtained in magnetic trilayers in a current-in-plane geometry owing to the existence of crossed Andreev reflection. This spin-valve consists...
Cooling electrons by magnetic-field tuning of Andreev reflection (2007)
Giazotto, Francesco, Taddei, Fabio, Governale, Michele, Castellana, Carlo, Fazio, Rosario, Beltram, Fabio
A solid-state cooling principle based on magnetic-field-driven tunable suppression of Andreev reflection in superconductor/two-dimensional electron gas nanostructures is proposed. This cooling...
Huge nonequilibrium magnetoresistance in hybrid superconducting spin valves (2007)
Giazotto, Francesco, Taddei, Fabio, Fazio, Rosario, Beltram, Fabio
A hybrid ferromagnet-superconductor spin valve is proposed. Its operation relies on the interplay between nonequilibrium transport and proximity-induced exchange coupling in superconductors. Huge...
Electronic Hong-Ou-Mandel interferometer for multimode entanglement detection (2007)
Giovannetti, Vittorio, Frustaglia, Diego, Taddei, Fabio, Fazio, Rosario
We show that multi-mode entanglement of electrons in a mesoscopic conductor can be detected by a measurement of the zero-frequency current correlations in an electronic Hong-Ou-Mandel interferometer....
Anomalous suppression of the shot noise in a nanoelectromechanical system (2007)
Haupt, Federica, Cavaliere, Fabio, Fazio, Rosario, Sassetti, Maura
In this paper we report a relaxation-induced suppression of the noise for a single level quantum dot coupled to an oscillator with incoherent dynamics in the sequential tunneling regime. It is shown...
Model of qubits as devices to detect the third moment of current fluctuations (2007)
Brosco, Valentina, Fazio, Rosario, Hekking, F.W.J., Pekola, J.P.
Under appropriate conditions controllable two-level systems can be used to detect the third moment of current fluctuations. We derive a Master Equation for a quantum system coupled to a bath valid to...
Entanglement production in chaotic quantum dots subject to spin-orbit coupling (2007)
Frustaglia, Diego, Montangero, Simone, Fazio, Rosario
We study numerically the production of orbital and spin entangled states in chaotic quantum dots for non-interacting electrons. The introduction of spin-orbit coupling permit us to identify...
Decoherence by engineered quantum baths (2007)
Rossini, Davide, Calarco, Tommaso, Giovannetti, Vittorio, Montangero, Simone, Fazio, Rosario
We introduce, and determine decoherence for, a wide class of non-trivial quantum spin baths which embrace Ising, XY and Heisenberg universality classes coupled to a two-level system. For the XY and...
Information transfer rates in spin quantum channels (2007)
Rossini, Davide, Giovannetti, Vittorio, Fazio, Rosario
We analyze the communication efficiency of quantum information transfer along unmodulated spin chains by computing the communication rates of various protocols. The effects of temporal correlations...
Pumping through a quantum dot in the proximity of a superconductor (2007)
Splettstoesser, Janine, Governale, Michele, Koenig, Juergen, Taddei, Fabio, Fazio, Rosario
We study adiabatic pumping through a quantum dot tunnel-coupled to one normal and one superconducting lead. We generalize a formula which relates the pumped charge through a quantum dot with Coulomb...
Luther-Emery Phase and Atomic-Density Waves in a Trapped Fermion Gas (2007)
Xianlong, Gao, Rizzi, Matteo, Polini, Marco, Fazio, Rosario, Tosi, Mario P., Campo, Vivaldo L. Jr., ...
The Luther-Emery liquid is a state of matter that is predicted to occur in one-dimensional systems of interacting fermions and is characterized by a gapless charge spectrum and a gapped spin...
Characterizing electron entanglement in multiterminal mesoscopic conductors (2007)
Giovannetti, Vittorio, Frustaglia, Diego, Taddei, Fabio, Fazio, Rosario
We show that current correlations at the exit ports of a beam splitter can be used to detect electronic entanglement for a fairly general input state. This includes the situation where electron pairs...
Transport properties of a periodically driven superconducting single-electron transistor (2007)
Romito, Alessandro, Montangero, Simone, Fazio, Rosario
We discuss coherent transport of Cooper pairs through a Cooper pair shuttle. We analyze both the DC and AC Josephson effect in the two limiting cases where the charging energy $E_C$ is either much...
Decoherence induced by interacting quantum spin baths (2007)
Rossini, Davide, Calarco, Tommaso, Giovannetti, Vittorio, Montangero, Simone, Fazio, Rosario
We study decoherence induced on a two-level system coupled to a one-dimensional quantum spin chain. We consider the cases where the dynamics of the chain is determined by the Ising, XY, or Heisenberg...
Multi-channel architecture for electronic quantum-Hall interferometry (2007)
Giovannetti, Vittorio, Taddei, Fabio, Frustaglia, Diego, Fazio, Rosario
We propose a new architecture for implementing electronic interferometry in quantum Hall bars. It exploits scattering among parallel edge channels. In contrast to previous developments, this one...
Anomalous density of states of a Luttinger liquid in contact with a superconductor. (2007)
Winkelholz, C., Fazio, Rosario, Hekking, Frank W.J., Schoen, Gerd
Tunneling into one-dimensional Josephson chains and Luttinger liquids. (2007)
Fazio, Rosario, Wagenblast, Karl-Heinz, Winkelholz, C., Schoen, Gerd
Superconductor-insulator transition with a non-universal conductivity. (2007)
Wagenblast, Karl-Heinz, Fazio, Rosario, Schoen, Gerd, Zimanyi, Gergeley T.
Aharonov-Bohm-type oscillations of thermopower in a quantum dot ring geometry. (2007)
Blanter, Ya.M., Bruder, Christoph, Fazio, Rosario, Schoeller, Herbert
Wagenblast, Karl-Heinz, Fazio, Rosario, Otterlo, Anne Van, Schoen, Gerd, Zappala, Dario, Zimanyi, Gergeley T.
Adiabatic quantum dynamics of a random Ising chain across its quantum critical point (2007)
Caneva, Tommaso, Fazio, Rosario, Santoro, Giuseppe E.
We present here our study of the adiabatic quantum dynamics of a random Ising chain across its quantum critical point. The model investigated is an Ising chain in a transverse field with disorder...
Giazotto, F., Taddei, F., D'Amico, P., Fazio, Rosario, Beltram, F.
We analyze the broad range of spin-dependent nonequilibrium transport properties of hybrid systems composed of a normal region tunnel coupled to two superconductors with exchange fields induced by...
Mott-insulating and glassy phases of polaritons in 1D arrays of coupled cavities (2007)
Rossini, Davide, Fazio, Rosario
By means of analytical and numerical methods we analyze the phase diagram of polaritons in one-dimensional coupled cavities. We locate the phase boundary, discuss the behavior of the polariton...
Entanglement in Many-Body Systems (2007)
Amico, Luigi, Fazio, Rosario, Osterloh, Andreas, Vedral, Vlatko
The recent interest in aspects common to quantum information and condensed matter has prompted a prosperous activity at the border of these disciplines that were far distant until few years ago....
dc Josephson Effect in Metallic Single-Walled Carbon Nanotubes (2007)
Pugnetti, Stefano, Dolcini, Fabrizio, Fazio, Rosario
The dc Josephson effect is investigated in a single-walled metallic carbon nanotube connected to two superconducting leads. In particular, by using the Luttinger liquid theory, we analyze the effects...
The charge shuttle as a nanomechanical ratchet (2007)
We consider the charge shuttle proposed by Gorelik {\em et al.} driven by a time-dependent voltage bias. In the case of asymmetric setup, the system behaves as a rachet. For pure AC drive, the...
Characterizing electron entanglement in multiterminal mesoscopic conductors (2007)
Giovannetti, Vittorio, Frustaglia, Diego, Taddei, Fabio, Fazio, Rosario
We show that current correlations at the exit ports of a beam splitter can be used to detect electronic entanglement for a fairly general input state. This includes the situation where electron pairs...
Non-abelian superconducting pumps (2007)
Brosco, Valentina, Fazio, Rosario, Hekking, F. W. J., Joye, Alain
Cooper pair pumping is a coherent process. We derive a general expression for the adiabatic pumped charge in superconducting nanocircuits in the presence of level degeneracy and relate it to...
Pumping through a quantum dot in the proximity of a superconductor (2006)
Splettstoesser, Janine, Governale, Michele, König, Jürgen, Taddei, Fabio, Fazio, Rosario
We study adiabatic pumping through a quantum dot tunnel-coupled to one normal and one superconducting lead. We generalize a formula which relates the pumped charge through a quantum dot with Coulomb...
Decoherence induced by interacting quantum spin baths (2006)
Rossini, Davide, Calarco, Tommaso, Giovannetti, Vittorio, Montangero, Simone, Fazio, Rosario
We study decoherence induced on a two-level system coupled to a one-dimensional quantum spin chain. We consider the cases where the dynamics of the chain is determined by the Ising, XY, or Heisenberg...
Robust optimal quantum gates for Josephson charge qubits (2006)
Montangero, Simone, Calarco, Tommaso, Fazio, Rosario
Quantum optimal control theory allows to design accurate quantum gates. We employ it to design high-fidelity two-bit gates for Josephson charge qubits in the presence of both leakage and noise. Our...
Transport properties of a periodically driven superconducting single electron transistor (2006)
Romito, Alessandro, Montangero, Simone, Fazio, Rosario
We discuss coherent transport of Cooper pairs through a Cooper pair shuttle. We analyze both the DC and AC Josephson effect in the two limiting cases where the charging energy $E_C$ is either much...
Luther-Emery Phase and Atomic-Density Waves in a Trapped Fermion Gas (2006)
Xianlong, Gao, Rizzi, M., Polini, Marco, Fazio, Rosario, Tosi, M. P., Campo Jr., V. L., ...
The Luther-Emery liquid is a state of matter that is predicted to occur in one-dimensional systems of interacting fermions and is characterized by a gapless charge spectrum and a gapped spin...
Information transfer rates in spin quantum channels (2006)
Rossini, Davide, Giovannetti, Vittorio, Fazio, Rosario
We analyze the communication efficiency of quantum information transfer along unmodulated spin chains by computing the communication rates of various protocols. The effects of temporal correlations...
Dynamics and current fluctuations in an ac-driven charge shuttle (2006)
The behavior of a charge shuttle under a pure AC field has been recently considered theoretically and experimentally. If the system presents an asymmetry in the tunneling amplitudes the device acts...
Electronic Hong-Ou-Mandel interferometer for multi-mode entanglement detection (2006)
Giovannetti, Vittorio, Frustaglia, Diego, Taddei, Fabio, Fazio, Rosario
We show that multi-mode entanglement of electrons in a mesoscopic conductor can be detected by a measurement of the zero-frequency current correlations in an electronic Hong-Ou-Mandel interferometer....
Decoherence by engineered quantum baths (2006)
Rossini, Davide, Calarco, Tommaso, Giovannetti, Vittorio, Montangero, Simone, Fazio, Rosario
We introduce, and determine decoherence for, a wide class of non-trivial quantum spin baths which embrace Ising, XY and Heisenberg universality classes coupled to a two-level system. For the XY and...
Robustness of optimal working points for non-adiabatic holonomic quantum computation (2006)
Trullo, Antonio, Facchi, Paolo, Fazio, Rosario, Florio, Giuseppe, Giovannetti, Vittorio, Pascazio, Saverio
Geometric phases are an interesting resource for quantum computation, also in view of their robustness against decoherence effects. We study here the effects of the environment on a class of...
Splettstoesser, Janine, Governale, Michele, König, Jürgen, Fazio, Rosario
We present a diagrammatic real-time approach to adiabatic pumping of electrons through interacting quantum dots. Performing a systematic perturbation expansion in the tunnel-coupling strength, we...
Qubits as devices to detect the third moment of current fluctuations (2006)
Brosco, Valentina, Fazio, Rosario, Hekking, F. W. J., Pekola, J. P.
Under appropriate conditions controllable two-level systems can be used to detect the third moment of current fluctuations. We derive a Master Equation for a quantum system coupled to a bath valid to...
Huge nonequilibrium magnetoresistance in hybrid superconducting spin valves (2006)
Giazotto, F., Taddei, F., Fazio, Rosario, Beltram, F.
A hybrid ferromagnet-superconductor spin valve is proposed. Its operation relies on the interplay between nonequilibrium transport and proximity-induced exchange coupling in superconductors. Huge...
Entanglement production in chaotic quantum dots subject to spin-orbit coupling (2005)
Frustaglia, Diego, Montangero, Simone, Fazio, Rosario
We study numerically the production of orbital and spin entangled states in chaotic quantum dots for non-interacting electrons. The introduction of spin-orbit coupling permit us to identify...
Full Counting Statistics in Strongly Interacting Systems: Non-Markovian Effects (2005)
Braggio, Alessandro, König, Jürgen, Fazio, Rosario
We present a theory of full counting statistics for electron transport through interacting electron systems with non-Markovian dynamics. We illustrate our approach for transport through a...
Geometric phases and Andreev reflection in hybrid rings (2005)
Frustaglia, Diego, Taddei, Fabio, Fazio, Rosario
We study the Andreev reflection of a hybrid mesoscopic ring in the presence of a crown-like magnetic texture. By calculating the linear-response conductance as a function of the Zeeman splitting and...
Phase diagram of spin-1 bosons on one-dimensional lattices (2005)
Rizzi, Matteo, Rossini, Davide, De Chiara, Gabriele, Montangero, Simone, Fazio, Rosario
Spinor Bose condensates loaded in optical lattices have a rich phase diagram characterized by different magnetic order. Here we apply the Density Matrix Renormalization Group to accurately determine...
Adiabatic pumping in a Superconductor-Normal-Superconductor weak link (2005)
Governale, M., Taddei, F., Hekking, F. W. J., Fazio, Rosario
We present a formalism to study adiabatic pumping through a superconductor - normal - superconductor weak link. At zero temperature, the pumped charge is related to the Berry phase accumulated, in a...
Adiabatic pumping through interacting quantum dots (2005)
Splettstoesser, Janine, Governale, Michele, König, Jürgen, Fazio, Rosario
We present a general formalism to study adiabatic pumping through interacting quantum dots. We derive a formula that relates the pumped charge to the local, instantaneous Green function of the dot....
Clauser-Horne inequality and decoherence in mesoscopic conductors (2005)
Prada, Elsa, Taddei, Fabio, Fazio, Rosario
We analyze the effect of decoherence on the violation of the Clauser-Horne (CH) inequality for the full electron counting statistics in a mesoscopic multiterminal conductor. Our setup consists of an...
Superconducting Fluctuation Corrections to the Thermal Current in Granular Metals (2005)
Biagini, C., Ferone, R., Fazio, Rosario, Hekking, F. W. J., Tognetti, V.
The first-order superconducting fluctuation corrections to the thermal conductivity of a granular metal are calculated. A suppression of thermal conductivity proportional to $T_c/(T-T_c)$ is observed...
From perfect to fractal transmission in spin chains (2005)
De Chiara, Gabriele, Rossini, Davide, Montangero, Simone, Fazio, Rosario
Perfect state transfer is possible in modulated spin chains, imperfections however are likely to corrupt the state transfer. We study the robustness of this quantum communication protocol in the...
Quantum relative positioning in Hilbert space (2005)
Giovannetti, Vittorio, Fazio, Rosario
A new class of state transformations that are quantum mechanically prohibited is introduced. These can be seen as the generalization of the universal-NOT transformation which, for all pure inputs...
Fully Frustrated Cold Atoms (2005)
Polini, Marco, Fazio, Rosario, MacDonald, A. H., Tosi, M. P.
Fully frustrated Josephson Junction arrays (FF-JJA's) exhibit a subtle compound phase transition in which an Ising transition associated with discrete broken translational symmetry and a...
C. Bruder, Rosario Fazio, Gerd Schön
Key words Bose-Hubbard model, Josephson junction arrays, optical lattices
Continuous measurements of two qubits (2004)
Mao, Wenjin, Averin, Dmitri V., Plastina, Francesco, Fazio, Rosario
We develop a theory of coherent quantum oscillations in two, in general interacting, qubits measured continuously by a mesoscopic detector with arbitrary non-linearity and discuss an example of SQUID...
Solid-State Quantum Communication With Josephson Arrays (2004)
Romito, Alessandro, Fazio, Rosario, Bruder, C.
Josephson junction arrays can be used as quantum channels to transfer quantum information between distant sites. In this work we discuss simple protocols to realize state transfer with high fidelity....
The charge shuttle as a nanomechanical ratchet (2004)
We consider the charge shuttle proposed by Gorelik {\em et al.} driven by a time-dependent voltage bias. In the case of asymmetric setup, the system behaves as a rachet. For pure AC drive, the...
Dynamical Imperfections in quantum computers (2004)
Facchi, Paolo, Montangero, Simone, Fazio, Rosario, Pascazio, Saverio
We study the effects of dynamical imperfections in quantum computers. By considering an explicit example, we identify different regimes ranging from the low-frequency case, where the imperfections...
Chaotic dynamics in superconducting nanocircuits (2004)
Montangero, Simone, Romito, Alessandro, Benenti, Giuliano, Fazio, Rosario
The quantum kicked rotator can be realized in a periodically driven superconducting nanocircuit. A study of the fidelity allows the experimental investigation of exponential instability of quantum...
Information-capacity description of spin-chain correlations (2004)
Giovannetti, Vittorio, Fazio, Rosario
Information capacities achievable in the multi-parallel-use scenarios are employed to characterize the quantum correlations in unmodulated spin chains. By studying the qubit amplitude damping...
Mesoscopic supercurrent transistor controlled by nonequilibrium cooling (2004)
Giazotto, F., Heikkila, T. T., Taddei, F., Fazio, Rosario, Pekola, J. P., Beltram, F.
The distinctive quasiparticle distribution existing under nonequilibrium in a superconductor-insulator-normal metal-insulator-superconductor (SINIS) mesoscopic line is proposed as a novel tool to...
Andreev interference in adiabatic pumping (2004)
Taddei, Fabio, Governale, Michele, Fazio, Rosario
Within the scattering approach, we develop a model for adiabatic quantum pumping in hybrid normal/superconductor systems where several superconducting leads are present. This is exploited to study...
Pairing fluctuations in trapped Fermi gases (2004)
Viverit, Luciano, Bruun, Georg M., Minguzzi, Anna, Fazio, Rosario
Fluctuations of the amplitude of the order parameter govern the properties of superconducting systems close to the critical transition temperature. In the BCS regime we examine the contribution of...
Thermal transport in granular metals (2004)
Beloborodov, I. S., Lopatin, A. V., Hekking, F. W. J., Fazio, Rosario, Vinokur, V. M.
We study the electron thermal transport in granular metals at large tunnel conductance between the grains, $g_T \gg 1$ and not too low a temperature $T > g_T\delta$, where $\delta$ is the mean energy...
Tailoring Josephson coupling through superconductivity-induced nonequilibrium (2003)
Giazotto, F., Heikkila, T. T., Taddei, F., Fazio, Rosario, Pekola, J. P., Beltram, F.
The distinctive quasiparticle distribution existing under nonequilibrium in a superconductor-insulator-normal metal-insulator-superconductor (SINIS) mesoscopic line is proposed as a novel tool to...
Dynamics of entanglement in quantum computers with imperfections (2003)
Montangero, Simone, Benenti, Giuliano, Fazio, Rosario
The dynamics of the pairwise entanglement in a qubit lattice in the presence of static imperfections exhibits different regimes. We show that there is a transition from a perturbative region, where...
Faoro, L., Taddei, F., Fazio, Rosario
In this paper we derive the Clauser-Horne (CH) inequality for the full electron counting statistics in a mesoscopic multiterminal conductor and we discuss its properties. We first consider the...
Measurement of coherent charge transfer in an adiabatic Cooper pair pump (2003)
Fazio, Rosario, Hekking, F. W. J., Pekola, J. P.
We study adiabatic charge transfer in a superconducting Cooper pair pump, focusing on the influence of current measurement on coherence. We investigate the limit where the Josephson coupling energy...
Non-Abelian Holonomies, Charge Pumping, and Quantum Computation with Josephson Junctions (2003)
Faoro, Lara, Siewert, Jens, Fazio, Rosario
Non-Abelian holonomies can be generated and detected in certain superconducting nanocircuits. Here we consider an example where the non-Abelian operations are related to the adiabatic charge dynamics...
Parity-dependent Kondo effect in ultrasmall metallic grains (2002)
Franzese, Giancarlo, Raimondi, Roberto, Fazio, Rosario
We study the Kondo effect in an ultrasmall metallic grain, i.e. small enough to have a discrete energy-level spectrum, by calculating the susceptibility chi of the magnetic impurity. Our quantum...
Decoherence in a Cooper pair shuttle (2002)
Romito, Alessandro, Plastina, Francesco, Fazio, Rosario
We examine decoherence effects in the Josephson current of a Cooper pair shuttle. Dephasing due to gate voltage fluctuations can either suppress or enhance the critical current and also change its...
Ferromagnetic resonant tunneling diodes as spin polarimeters and polarizers (2002)
Giazotto, Francesco, Taddei, Fabio, Fazio, Rosario, Beltram, Fabio
A method for measuring the degree of spin polarization of magnetic materials based on spin-dependent resonant tunneling is proposed. The device we consider is a ballistic double-barrier resonant...
Active suppression of dephasing in Josephson-junction qubits (2002)
Averin, Dmitri V., Fazio, Rosario
Simple majority code correcting $k$ dephasing errors by encoding a qubit of information into $2k+1$ physical qubits is studied quantitatively. We derive an equation for quasicontinuous evolution of...
Pumping spin with electrical fields (2002)
Governale, M., Taddei, F., Fazio, Rosario
Spin currents can be obtained through adiabatic pumping by means of electrical gating only. This is possible by making use of the tunability of the Rashba spin-orbit coupling in semiconductor...
Choi, Mahn-Soo, Plastina, Francesco, Fazio, Rosario
We analyze charge tunneling statistics and current noise in a superconducting single-electron transistor in a regime where the Josephson-quasiparticle cycle is the dominant mechanism of transport....
Interplay between pairing and exchange in small metallic dots (2002)
Falci, G., Fazio, Rosario, Mastellone, A.
We study the effects of the mesoscopic fluctuations on the competition between exchange and pairing interactions in ultrasmall metallic dots when the mean level spacing is comparable or larger than...
Josephson current in ballistic Nb/InAs/Nb highly transmissive junctions (2002)
Giazotto, Francesco, Grove-Rasmussen, Kasper, Fazio, Rosario, Beltram, Fabio, Linfield, Edmund H., Ritchie, David A.
Highly transmissive ballistic junctions are demonstrated between Nb and the two-dimensional electron gas formed at an InAs/AlSb heterojunction. A reproducible fabrication protocol is presented...
Non-Abelian phases, charge pumping, and quantum computation with Josephson junctions (2002)
Faoro, Lara, Siewert, Jens, Fazio, Rosario
Non-Abelian geometric phases can be generated and detected in certain superconducting nanocircuits. Here we consider an example where the holonomies are related to the adiabatic charge dynamics of...
Decoherence and 1/f noise in Josephson qubits (2002)
Paladino, E., Faoro, L., Falci, G., Fazio, Rosario
We propose and study a model of dephasing due to an environment of bistable fluctuators. We apply our analysis to decoherence of Josephson Qubits, induced by background charges present in the...
Implementation of the Deutsch-Jozsa algorithm with Josephson charge qubits (2001)
We investigate the realization of a simple solid-state quantum computer by implementing the Deutsch-Jozsa algorithm in a system of Josephson charge qubits. Starting from a procedure to carry out the...
Glassy dynamics of Josephon arrays on a dice lattice (2001)
Cataudella, Vittorio, Fazio, Rosario
In this Letter we study the phase diagram and the approach to the equilibrium of Josephson junction arrays on a dice lattice for two different values of the magnetic frustration ($f=1/2,1/3$). In...
Quantum Algorithms for Josephson Networks (2001)
We analyze possible implementations of quantum algorithms in a system of (macroscopic) Josephson charge qubits. System layout and parameters to realize the Deutsch algorithm with up to three qubits...
Positive cross-correlations induced by ferromagnetic contacts (2001)
Due to the Fermionic nature of carriers, correlations between electric currents flowing through two different contacts attached to a conductor present a negative sign. Possibility for positive...
Counting statistics for entangled electrons (2001)
The counting statistics (CS) for charges passing through a coherent conductor is the most general quantity that characterizes electronic transport. CS not only depends on the transport properties of...
Thermoelectric effects in Kondo correlated quantum dots (2001)
In this Letter we study thermoelectric effects in ultra small quantum dots. We study the behaviour of the thermopower, Peltier coefficient and thermal conductance both in the sequencial tunneling...
Quantum algorithms for Josephson networks (2001)
We analyze possible implementations of quantum algorithms in a system of (macroscopic) Josephson charge qubits. System layout and parameters to realize the Deutsch algorithm with up to three qubits...
Macroscopic entanglement in Josephson nanocircuits (2001)
Plastina, Francesco, Fazio, Rosario, Palma, G. Massimo
We propose a scheme to generate and detect entanglement between charge states in superconducting nanocircuits. We discuss different procedures to discriminate such entanglement from classical...
Coherent oscillations in a Cooper-pair box (2001)
Choi, Mahn-Soo, Fazio, Rosario, Siewert, Jens, Bruder, C.
This paper is devoted to an analysis of the experiment by Nakamura {\it et al.} (Nature {\bf 398}, 786 (1999)) on the quantum state control in Josephson junctions devices. By considering the relevant...
Shot noise for resonant Cooper pair tunneling (2001)
Choi, Mahn-Soo, Plastina, Francesco, Fazio, Rosario
We study intrinsic noise of current in a superconducting single-electron transistor, taking into account both coherence effects and Coulomb interaction near a Cooper-pair resonance. Due to this...
Quantum Phase Transitions and Vortex Dynamics in Superconducting Networks (2000)
Fazio, Rosario, Van Der Zant, Herre
Josephson junction arrays are ideal model systems where a variety of phenomena, phase transitions, frustration effects, vortex dynamics, chaos, to mention a few of them, can be studied in a...
Detection of Geometric Phases in Superconducting Nanocircuits (2000)
Falci, Giuseppe, Fazio, Rosario, Palma, G. Massimo, Siewert, Jens, Vedral, Vlatko
When a quantum mechanical system undergoes an adiabatic cyclic evolution it acquires a geometrical phase factor in addition to the dynamical one. This effect has been demonstrated in a variety of...
The BCS model and the off shell Bethe ansatz for vertex models (2000)
Amico, Luigi, Falci, G., Fazio, Rosario
We study the connection between the BCS pairing model and the inhomogeneous vertex model. The two spectral problems coincide in the quasi-classical limit of the off-shell Bethe Ansatz of the...
Evidence of two-electron tunneling interference in Nb/InAs junctions (2000)
Badolato, Antonio, Giazotto, Francesco, Lazzarino, Marco, Pingue, Pasqualantonio, Beltram, Fabio, Lucheroni, Carlo, ...
The impact of junction transparency in driving phase-coherent charge transfer across diffusive semiconductor-superconductor junctions is demonstrated. We present conductivity data for a set of...
Re-entrant spin susceptibility of a superconducting grain (1999)
Di Lorenzo, A., Fazio, Rosario, Hekking, F. W. J., Falci, G., Mastellone, A., Giaquinta, G.
We study the spin susceptibility chi of a small, isolated superconducting grain. Due to the interplay between parity effects and pairing correlations, the dependence of chi on temperature T is...
Fidelity and leakage of Josephson qubits (1999)
Fazio, Rosario, Palma, G. Massimo, Siewert, Jens
The unit of quantum information is the qubit, a vector in a two-dimensional Hilbert space. On the other hand, quantum hardware often operates in two-dimensional subspaces of vector spaces of higher...
Abilio, C. C., Amico, L., Fazio, Rosario, Pannetier, B.
The transition line of superconducting arrays of holes exhibits a rich field structure due to the interference of superconducting states nucleated at the holes edges. We studied by means of...
Local Density of States in Superconductor-Ferromagnetic Hybrid Systems (1998)
Fazio, Rosario, Lucheroni, Carlo
In this Letter we discuss various properties of the local density of states (DOS) for a superconductor-ferromagnet hybrid system. The DOS is modified at small energies on both sides of the interface....
Properties of superconductor - Luttinger liquid hybrid systems (1998)
Fazio, Rosario, Hekking, F. W. J., Odintsov, A. A., Raimondi, R.
In this paper we review some recent results concerning the physics of superconductor - Luttinger liquid proximity systems. We discuss both equilibrium (the pair amplitude, Josephson current, and the...
A small superconducting grain in the canonical ensemble (1998)
Mastellone, A., Falci, G., Fazio, Rosario
By means of the Lanczos method we analyze superconducting correlations in ultrasmall grains at fixed particle number. We compute the ground state properties and the excitation gap of the pairing...
Anomalous Thermal Transport in Quantum Wires (1997)
Fazio, Rosario, Hekking, F. W. J., Khmelnitskii, D. E.
We study thermal transport in a one-dimensional quantum wire, connected to reservoirs. Despite of the absence of electron backscattering, interactions in the wire strongly influence thermal...
Resonant Andreev Tunneling in Strongly Interacting Quantum Dots (1997)
Fazio, Rosario, Raimondi, Roberto
We study resonant Andreev tunneling through a strongly interacting quantum dot connected to a normal and to a superconducting lead. We obtain a formula for the Andreev current and apply it to discuss...
Duality in Josephson Junction Arrays (1997)
Blanter, Ya. M., Fazio, Rosario, Schoen, Gerd
Various properties of mesoscopic two-dimensional Josephson junction arrays are reviewed. Particular attention is paid to structure of the topological excitations, charges and vortices, which are...
Aharonov-Bohm-type oscillations of thermopower in a quantum dot ring geometry. (1997)
Blanter, Ya.M., Bruder, Christoph, Fazio, Rosario, Schoeller, Herbert
Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition (1996)
Wagenblast, Karl-Heinz, Fazio, Rosario
We study the flux noise in Josephson junction arrays in the critical regime above the Berezinskii-Kosterlitz-Thouless transition. In proximity coupled arrays a local ohmic damping for the phases is...
Aharonov-Bohm-Type Oscillations of Thermopower in a Quantum Dot Ring Geometry (1996)
Blanter, Ya. M., Bruder, C., Fazio, Rosario, Schoeller, Herbert
We investigate Aharonov-Bohm-type oscillations of the thermopower of a quantum dot embedded in a ring for the case when the interaction between electrons can be neglected. The thermopower is shown to...
Supersolid phase in fully frustrated Josephson junction arrays (1996)
Amico, Luigi, Falci, Giuseppe, Fazio, Rosario, Giaquinta, Gaetano
We study the phase diagram and the excitation spectra of an array of small Josephson junctions at $f=1/2$ and arbitrary charge frustration. We find that the supersolid region in the phase diagram is...
Anomalous density of states of a Luttinger liquid in contact with a superconductor (1996)
Winkelholz, C., Fazio, Rosario, Hekking, F. W. J., Schön, Gerd
We study the frequency and space dependence of the local tunneling density of states of a Luttinger liquid (LL) which is connected to a superconductor. This coupling {\em strongly} modifies the...
Anomalous density of states of a Luttinger liquid in contact with a superconductor. (1996)
Winkelholz, C., Fazio, Rosario, Hekking, Frank W.J., Schoen, Gerd
Wagenblast, Karl-Heinz, Fazio, Rosario, Otterlo, Anne Van, Schoen, Gerd, Zappala, Dario, Zimanyi, Gergeley T.
Tunneling into one-dimensional Josephson chains and Luttinger liquids. (1996)
Fazio, Rosario, Wagenblast, Karl-Heinz, Winkelholz, C., Schoen, Gerd
Superconductor-insulator transition with a non-universal conductivity. (1996)
Wagenblast, Karl-Heinz, Fazio, Rosario, Schoen, Gerd, Zimanyi, Gergeley T.
Tunneling into one-dimensional Josephson chains and Luttinger liquids (1996)
Rosario Fazio, Karl-Heinz Wagenblast, Carsten Winkelholz, Gerd Schön
One-dimensional arrays of Josephson junctions have been studied because of their unusual zero-temperature superconductor-insulator phase transitions. Furthermore, their low-energy Hamiltonian...
Aharonov-Bohm oscillations and resonant tunneling in strongly correlated quantum dots (1995)
Bruder, C., Fazio, Rosario, Schoeller, Herbert
We investigate Aharonov-Bohm oscillations of the current through a strongly correlated quantum dot embedded in an arbitrary scattering geometry. Resonant-tunneling processes lead to a flux-dependent...
$\epsilon$-Expansion of the Conductivity at the Superconductor-Mott Insulator Transition (1995)
Fazio, Rosario, Zappala`, Dario
We study the critical behavior of the conductivity $\sigma(\omega)$ at the zero temperature superconductor-Mott insulator transition in $d$ space-time dimensions for a model of bosons with...
DC and AC Josephson Effect in a Superconductor-Luttinger Liquid-Superconductor System (1995)
Fazio, Rosario, Hekking, F. W. J., Odintsov, A. A.
We calculate both the DC and the AC Josephson current through a one-dimensional system of interacting electrons, connected to two superconductors by tunnel junctions. We treat the (repulsive) Coulomb...
Quantum-Phase Transitions of Interacting Bosons and the Supersolid Phase (1995)
Van Otterlo, Anne, Wagenblast, Karl-Heinz, Baltin, Reinhard, Bruder, C., Fazio, Rosario, Schön, Gerd
We investigate the properties of strongly interacting bosons in two dimensions at zero temperature using mean-field theory, a variational Ansatz for the ground state wave function, and Monte Carlo...
Andreev tunneling into a one-dimensional Josephson junction array (1995)
Falci, G., Fazio, Rosario, Tagliacozzo, A., Giaquinta, G.
In this letter we consider Andreev tunneling between a normal metal and a one dimensional Josephson junction array with finite-range Coulomb energy. The $I-V$ characteristics strongly deviate from...
Resonant Tunneling and Charging Effects, a Path Integral Approach (1995)
König, Jürgen, Schoeller, Herbert, Schön, Gerd, Fazio, Rosario
Electron tunneling through small metallic islands with low capacitance is studied. The large charging energy in these systems is responsible for nonperturbative Coulomb blockade effects. We further...
Josephson current through a Luttinger liquid (1994)
Fazio, Rosario, Hekking, F. W. J., Odintsov, A. A.
We study the Josephson effect through a one-dimensional system of interacting electrons, connected to two superconductors by tunnel junctions. The interactions are treated in the framework of the...
Proximity Effect and Charging in Mesoscopic Normal Metal - Superconductor Junction Systems (1994)
Bruder, C., Fazio, Rosario, Schön, Gerd
Charging effects in mesoscopic junctions suppress the tunneling of electrons. In normal metal - superconductor systems they also suppress the proximity effect, thereby revealing the nature of the...
Quantum Vortices Near the Superconductor-Insulator Transition in Josephson Junction Arrays (1993)
Van Otterlo, Anne, Fazio, Rosario
The properties of vortices in Josephson junction arrays are investigated in the quantum regime near the superconductor-insulator transition. We derive and study an effective action for vortex...