Nuclear magnetism and electron order in interacting one-dimensional conductors (2009)
Braunecker, Bernd, Simon, Pascal, Loss, Daniel
The interaction between localized magnetic moments and the electrons of a one-dimensional conductor can lead to an ordered phase in which the magnetic moments and the electrons are tightly bound to...
Relaxation of hole spins in quantum dots via two-phonon processes (2009)
Trif, Mircea, Simon, Pascal, Loss, Daniel
We investigate theoretically spin relaxation in heavy hole quantum dots in low external magnetic fields. We demonstrate that two-phonon processes and spin-orbit interaction are experimentally...
Self-consistent description of Andreev bound states in Josephson quantum dot devices (2009)
Meng, Tobias, Simon, Pascal, Florens, Serge
We develop a general perturbative framework based on a superconducting atomic limit for the description of Andreev bound states (ABS) in interacting quantum dots connected to superconducting leads. A...
Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers (2009)
Sandler, Nancy, Simon, Pascal, Ingersent, Kevin, Ulloa, Sergio E.
We study two quantum dots embedded in the arms of an Aharonov-Bohm ring threaded by a magnetic flux. This system can be described by an effective one-impurity Anderson model with an energy- and...
Chesi, Stefano, Zak, Robert Andrzej \., Simon, Pascal, Loss, Daniel
We consider the effect of rescattering of pairs of quasiparticles in the Cooper channel resulting in the strong renormalization of second-order corrections to the spin susceptibility in a...
Magnetic Order in Kondo-Lattice Systems due to Electron-Electron Interactions (2008)
Braunecker, Bernd, Simon, Pascal, Loss, Daniel
The hyperfine interaction between the electron spin and the nuclear spins is one of the main sources of decoherence for spin qubits when the nuclear spins are disordered. An ordering of the latter...
Towards a microscopic description of dimer adsorbates on metallic surfaces (2008)
Merino, Jaime, Borda, Laszlo, Simon, Pascal
Despite the experimental successes of Scanning Tunneling Microscopy (STM) and the interest in more complex magnetic nanostructures, our present understanding and theoretical description of STM...
Nuclear Magnetism and Electronic Order in 13C Nanotubes (2008)
Braunecker, Bernd, Simon, Pascal, Loss, Daniel
Single wall carbon nanotubes grown entirely from 13-C form an ideal system to study the effect of electron interaction on nuclear magnetism in one dimension. If the electrons are in the metallic,...
AC magnetization transport and power absorption in non-itinerant spin chains (2008)
Trauzettel, Bjoern, Simon, Pascal, Loss, Daniel
We investigate the ac transport of magnetization in non-itinerant quantum systems such as spin chains described by the XXZ Hamiltonian. Using linear response theory, we calculate the ac magnetization...
Saliency Maps Operating on Stereo Images Detect Landmarks and their Distance (2008)
Jörg Conradt, Pascal Simon, Michel Pescatore
Abstract. We present a model that uses binocular visual input to detect landmarks and estimates their distance based on disparity between the two images. Feature detectors provide input to saliency...
Magnetic Ordering of Nuclear Spins in an Interacting 2D Electron Gas (2007)
Simon, Pascal, Braunecker, Bernd, Loss, Daniel
We investigate the magnetic behavior of nuclear spins embedded in a 2D interacting electron gas using a Kondo lattice model description. We derive an effective magnetic Hamiltonian for the nuclear...
Andergassen, Sabine, Simon, Pascal, Florens, Serge, Feinberg, Denis
Strong correlation effects in a capacitively coupled double quantum-dot setup were previously shown to provide the possibility of both entangling spin-charge degrees of freedom and realizing...
Spectroscopic analysis of finite size effects around a Kondo quantum dot (2007)
Simon, Pascal, Feinberg, Denis
We consider a simple setup in which a small quantum dot is strongly connected to a finite size box. This box can be either a metallic box or a finite size quantum wire.The formation of the Kondo...
Quantum Criticality in a Double Quantum-Dot System (2007)
Zarand, Gergely, Chung, Chung-Hou, Simon, Pascal, Vojta, Matthias
Interplay of electromagnetic noise and Kondo effect in quantum dots (2006)
Florens, Serge, Simon, Pascal, Andergassen, Sabine, Feinberg, Denis
We investigate the influence of an electromagnetic environment, characterized by a finite impedance $Z(\omega)$, on the Kondo effect in quantum dots. The circuit voltage fluctuations couple to charge...
Kondo screening cloud in a double-quantum dot system (2006)
We analyze the transport properties of two artificial magnetic impurities coupled togethervia a tunable RKKY interaction mediated by conduction electrons of a finite size one dimensional wire. We...
Kondo screening cloud effects in mesoscopic devices (2006)
We study how finite size effects may appear when a quantum dot in the Kondo Coulomb blockade regime is embedded into a mesoscopic device with finite wires. These finite size effects appear when the...
Nuclear spin ferromagnetic phase transition in an interacting 2D electron gas (2006)
Electrons in a two-dimensional semiconducting heterostructure interact with nuclear spins via the hyperfine interaction. Using a a Kondo lattice formulation of the electron-nuclear spin interaction,...
Underscreened Kondo impurities in a Luttinger liquid (2006)
Durganandini, P., Simon, Pascal
We study the problem of underscreened Kondo physics in an interacting electronic system modeled by a Luttiger Liquid (LL). We find that the leading temperature dependence of thermodynamical...
Quantum criticality in a double quantum-dot system (2006)
Zarand, Gergely, Chung, Chung-Hou, Simon, Pascal, Vojta, Matthias
We discuss the realization of the quantum-critical non-Fermi liquid state, originally discovered within the two-impurity Kondo model, in double quantum-dot systems. Contrary to the common belief, the...
Transport Spectroscopy of a Kondo quantum dot coupled to a finite size grain (2006)
Simon, Pascal, Salomez, Julien, Feinberg, Denis
We analyse a simple setup in which a quantum dot is strongly connected to a metallic grain or finite size wire and weakly connected to two normal leads. The Kondo screening cloud essentially develops...
Simon, Pascal, Feinberg, Denis
A double quantum dot inserted in parallel between two metallic leads allows to entangle the electron spin with the orbital (dot index) degree of freedom. An Aharonov-Bohm orbital phase can then be...
Simon, Pascal, Entin-Wohlman, Ora, Aharony, Amnon
An Aharonov-Bohm interferometer (ABI) carrying a quantum dot on one of its arms is analyzed. It is found that the Kondo temperature of the device depends strongly on the magnetic flux penetrating the...
Kondo screening cloud in a double-quantum dot system (2005)
We analyze the transport properties of two artificial magnetic impurities coupled togethervia a tunable RKKY interaction mediated by conduction electrons of a finite size one dimensional wire. We...
Exotic Kondo effect from magnetic trimers (2004)
Lazarovits, Bence, Simon, Pascal, Zarand, Gergely, Szunyogh, Laszlo
Motivated by the recent experiments of Jamneala {\em et al.} [T. Jamnaela {\em et al.}, Phys. Rev. Lett. {\bf 87}, 256804 (2001)], by combining {\em ab-initio} and renormalization group methods, we...
RKKY and magnetic field interactions in coupled Kondo quantum dots (2004)
Simon, Pascal, Lopez, Rosa, Oreg, Yuval
We investigate theoretically the transport properties of two independent artificial Kondo impurities. They are coupled together via a tunable Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction. For...
Splitting electronic spins with a Kondo double dot device (2004)
Feinberg, Denis, Simon, Pascal
We present a simple device made of two small capacitively coupled quantum dots in parallel. This set-up can be used as an efficient "Stern-Gerlach" spin filter, able to simultaneously produce, from a...
Probing spin and orbital Kondo effects with a mesoscopic interferometer (2004)
Lopez, Rosa, Sanchez, David, Lee, Minchul, Choi, Mahn-Soo, Simon, Pascal, Hur, Karyn Le
We investigate theoretically the transport properties of a closed Aharonov-Bohm interferometer containing two quantum dots in the strong coupling regime. We find two distinct physical scenarios...
Maximized Orbital and Spin Kondo effects in a single-electron transistor (2003)
Hur, Karyn Le, Simon, Pascal, Borda, Laszlo
We investigate the charge fluctuations of a single-electron box (metallic grain) coupled to a lead via a smaller quantum dot in the Kondo regime. The most interesting aspect of this problem resides...
Kondo screening cloud effects in mesoscopic devices (2003)
We study how finite size effects may appear when a quantum dot in the Kondo Coulomb blockade regime is embedded into a mesoscopic device with finite wires. These finite size effects appear when the...
Des systèmes bidimensionnels frustrés aux modèles minimaux couplés (2003)
L'étude des systèmes magnétiques présentant de nouveaux types d'ordre non conventionnels induits notamment par de la frustration ou par le désordre d\^u aux impuretés fait actuellement l'objet...
Smearing of charge fluctuations in a grain by spin-flip assisted tunneling (2002)
We investigate the charge fluctuations of a grain (large dot) coupled to a lead via a small quantum dot in the Kondo regime. We show that the strong entanglement of charge and spin flips in this...
Detecting the Kondo screening cloud in conductance measurements on quantum dots (2002)
The observation of the Kondo effect in quantum dots has provided new opportunities to finally observe the controversial Kondo screening cloud. We study how screening cloud effects appear in the...
Emergence of Irrationality: Magnetization Plateaus in Modulated Hubbard Chains (2001)
Cabra, D. C., De Martino, A., Honecker, A., Pujol, P., Simon, Pascal
Hubbard chains with periodically modulated coupling constants in a magnetic field exhibit gaps at zero temperature in their magnetic and charge excitations in a variety of situations. In addition to...
Detecting the Kondo screening cloud around a quantum dot (2000)
A fundamental prediction of scaling theories of the Kondo effect is the screening of an impurity spin by a cloud of electrons spread out over a mesoscopic distance. This cloud has never been observed...
Fioravanti, Davide, Mussardo, Giuseppe, Simon, Pascal
The scaling form of the free-energy near a critical point allows for the definition of various thermodynamical amplitudes and the determination of their dependence on the microscopic non-universal...
Universal Ratios in the 2D Tricritical Ising Model (2000)
Fioravanti, Davide, Mussardo, Giuseppe, Simon, Pascal
We consider the universality class of the two-dimensional Tricritical Ising Model. The scaling form of the free-energy naturally leads to the definition of universal ratios of critical amplitudes...
Doping-dependent magnetization plateaux in p-merized Hubbard chains (1999)
Cabra, D. C., De Martino, A., Honecker, A., Pujol, P., Simon, Pascal
Coupled Ising models with disorder (1999)
Simon, Pascal, Ricci-Tersenghi, Federico
In this paper we study the phase diagram of two Ising planes coupled by a standard spin-spin interaction with bond randomness in each plane. The whole phase diagram is analyzed by help of Monte Carlo...
Des systèmes bidimensionnels frustrés aux modèles minimaux couplés (1998)
L'étude des systèmes magnétiques présentant de nouveaux types d'ordre non conventionnels induits notamment par de la frustration ou par le désordre d ^u aux impuretés fait actuellement l'objet...
Des systèmes bidimensionnels frustrés aux modèles minimaux couplés (1998)
L'étude des systèmes magnétiques présentant de nouveaux types d'ordre non conventionnels induits notamment par de la frustration ou par le désordre d\^u aux impuretés fait actuellement l'objet...
Des systèmes bidimensionnels frustrés aux modèles minimaux couplés (1998)
L'étude des systèmes magnétiques présentant de nouveaux types d'ordre non conventionnels induits notamment par de la frustration ou par le désordre d\^u aux impuretés fait actuellement l'objet...
Des systèmes bidimensionnels frustrés aux modèles minimaux couplés (1998)
L'étude des systèmes magnétiques présentant de nouveaux types d'ordre non conventionnels induits notamment par de la frustration ou par le désordre d\^u aux impuretés fait actuellement l'objet...
Des systèmes bidimensionnels frustrés aux modèles minimaux couplés (1998)
L'étude des systèmes magnétiques présentant de nouveaux types d'ordre non conventionnels induits notamment par de la frustration ou par le désordre d\^u aux impuretés fait actuellement l'objet...
Des systèmes bidimensionnels frustrés aux modèles minimaux couplés (1998)
L'étude des systèmes magnétiques présentant de nouveaux types d'ordre non conventionnels induits notamment par de la frustration ou par le désordre d\^u aux impuretés fait actuellement l'objet...