Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material (2008)
Rüegg, Ch., Kiefer, K., Thielemann, B., McMorrow, D. F., Zapf, V., Normand, B., ...
The phase diagram in temperature and magnetic field of the metal-organic, two-leg spin-ladder compound (C5H12N)2CuBr4 is studied by measurements of the specific heat and the magnetocaloric effect. We...
Orbital current patterns in doped two-leg Cu-O Hubbard ladders (2008)
Chudzinski, P., Gabay, M., Giamarchi, T.
In the weak coupling limit, we investigate two-leg ladders with a unit cell containing both Cu and O atoms, as a function of doping. For purely repulsive interactions, using bosonization, we find...
Controlling Luttinger liquid physics in spin ladders under magnetic field (2008)
Klanjsek, M., Mayaffre, H., Berthier, C., Horvatic, M., Chiari, B., Piovesana, O., ...
We present a 14N nuclear magnetic resonance study of a single crystal of CuBr4(C5H12N)2 (BPCB), which contains weakly coupled spin-1/2 Heisenberg antiferromagnetic ladders. Treating ladders in the...
The quasi-periodic Bose-Hubbard model and localization in one-dimensional cold atomic gases (2008)
Roux, G., Barthel, T., McCulloch, I. P., Kollath, C., Schollwoeck, U., Giamarchi, T.
We compute the phase diagram of the one-dimensional Bose-Hubbard model with a quasi-periodic potential by means of the density-matrix renormalization group technique. This model describes the physics...
Bose-Einstein Condensation in Magnetic Insulators (2007)
Giamarchi, T., Rüegg, Ch., Tchernyshyov, O.
The elementary excitations in antiferromagnets are magnons, quasiparticles with integer spin and Bose statistics. In an experiment their density is controlled efficiently by an applied magnetic field...
Doping dependence of the vortex-core energy in bilayer films of cuprates (2007)
Benfatto, L., Castellani, C., Giamarchi, T.
The energy needed to create a vortex core is the basic ingredient to address the physics of thermal vortex fluctuations in underdoped cuprates. Here we theoretically investigate its role on the...
Dipolar bosons in a planar array of one-dimensional tubes (2007)
Kollath, C., Meyer, Julia S., Giamarchi, T.
We investigate bosonic atoms or molecules interacting via dipolar interactions in a planar array of one-dimensional tubes. We consider the situation in which the dipoles are oriented perpendicular to...
Phase diagram of hole doped two-leg Cu-O ladders (2007)
Chudzinski, P., Gabay, M., Giamarchi, T.
In the weak coupling limit, we establish the phase diagram of a two-leg ladder with a unit cell containing both Cu and O atoms, as a function of doping. We use bosonization and design a specific RG...
Spin dynamics in a one-dimensional ferromagnetic Bose gas (2007)
Zvonarev, M. B., Cheianov, V. V., Giamarchi, T.
We investigate the propagation of spin excitations in a one-dimensional (1D) ferromagnetic Bose gas. While the spectrum of longitudinal spin waves in this system is sound-like, the dispersion of...
Sine-Gordon description of Beresinskii-Kosterlitz-Thouless physics at finite magnetic field (2007)
Benfatto, L., Castellani, C., Giamarchi, T.
The Beresinskii-Kosterlitz-Thouless (BKT) physics of vortices in two-dimensional superconductors at finite magnetic field is investigated by means of a field-theoretical approach based on the...
Thermal rounding of the depinning transition (2007)
Bustingorry, S., Kolton, A. B., Giamarchi, T.
We study thermal effects at the depinning transition by numerical simulations of driven one-dimensional elastic interfaces in a disordered medium. We find that the velocity of the interface,...
Adesso, M. G., Flukiger, R., Giamarchi, T., Goldacker, W., Kupfer, H., Pace, S., ...
We analyse the phase transition between the Bragg Glass and the Disordered phase in the vortex lattice in type-II superconductors, both by analytical computations and experimental investigations. It...
Spin-charge separation in two-component Bose-gases (2007)
Kleine, A., Kollath, C., McCulloch, I., Giamarchi, T., Schollwoeck, U.
We show that one of the key characteristics of interacting one-dimensional electronic quantum systems, the separation of spin and charge, can be observed in a two-component system of bosonic...
Zero field Wigner crystal (2007)
A candidate for the insulating phase of the 2D electron gas, seen in high mobility 2D MOSFETS and heterojunctions, is a Wigner crystal pinned by the incipient disorder. With this in view, we study...
Chitra, R., Giamarchi, T., Doussal, P. Le
We study the effects of weak disorder on a Wigner crystal in a magnetic field. We show that an elastic description of the pinned Wigner crystal provides an excellent framework to obtain most of the...
Meissner effect in a bosonic ladder (2007)
We investigate the effect of a magnetic field on a bosonic ladder. We show that such a system leads to the one dimensional equivalent of a vortex lattice in a superconductor. We investigate the...
Role of interchain hopping in two disordered chains of spinless fermions (2007)
Orignac, E., Suzumura, Y., Giamarchi, T.
The effect of interchain hopping and interaction on Anderson localization has been investigated for two coupled chains of spinless fermions with nearest neighbor interaction. Using the...
Olive, E., Soret, J. C., Doussal, P. Le, Giamarchi, T.
We present 3D numerical simulation results of moving vortex lattices in presence of 1D correlated disorder at zero temperature. Our results with field tilting confirm the theoritical predictions of a...
From Luttinger to Fermi liquids in organic conductors (2007)
This chapter reviews the effects of interactions in quasi-one dimensional systems, such as the Bechgaard and Fabre salts, and in particular the Luttinger liquid physics. It discusses in details how...
Iucci, A., Fiete, G. A., Giamarchi, T.
We obtain a closed-form analytical expression for the zero temperature Fourier transform of the $2k_F$ component of the density-density correlation function in a Luttinger liquid with different spin...
Competition between Vortex Unbinding and Tunneling in an Optical Lattice (2007)
Cazalilla, M. A., Iucci, A., Giamarchi, T.
We study a system of two-dimensional Bose gases trapped in minima of a deep one-dimensional optical lattice potential. Increasing the tunneling amplitude between adjacent gases drives a deconfinement...
Critical properties and Bose Einstein Condensation in dimer spin systems (2007)
Orignac, E., Citro, R., Giamarchi, T.
We analyze the spin relaxation time $1/T_1$ for a system made of weakly coupled one dimensional ladders.This system allows to probe the dimensional crossover between a Luttinger liquid and a...
Biermann, S., Georges, A., Lichtenstein, A., Giamarchi, T.
We investigate a system of one dimensional Hubbard chains of interacting fermions coupled by inter-chain hopping. Using a generalization of the Dynamical Mean Field Theory we study the deconfinement...
Dynamic Compressibility and aging in Wigner crystals and quantum glasses (2006)
Cugliandolo, L. F., Giamarchi, T., Doussal, P. Le
We study the non-equilibrium linear response of quantum elastic systems pinned by quenched disorder with Schwinger-Keldysh real-time techniques complemented by a mean-field variational approach. We...
Kosterlitz-Thouless behavior in layered superconductors: the role of the vortex-core energy (2006)
Benfatto, L., Castellani, C., Giamarchi, T.
In layered superconductors with small interlayer Josephson coupling vortex-antivortex phase fluctuations characteristic of quasi two-dimensional (2D) Kosterlitz-Thouless (KT) behavior are expected to...
Hall effect in strongly correlated low dimensional systems (2006)
León, G., Berthod, C., Giamarchi, T.
We investigate the Hall effect in a quasi one-dimensional system made of weakly coupled Luttinger Liquids at half filling. Using a memory function approach, we compute the Hall coefficient as a...
Modulation spectroscopy with ultracold fermions in an optical lattice (2006)
Kollath, C., Iucci, A., McCulloch, I., Giamarchi, T.
We propose an experimental setup of ultracold fermions in an optical lattice to determine the pairing gap in a superfluid state and the spin ordering in a Mott-insulating state. The idea is to apply...
Sacchetti, A., Degiorgi, L., Giamarchi, T., Ru, N., Fisher, I. R.
We report on the first optical measurements of the rare-earth tri-telluride charge-density-wave systems. Our data, collected over an extremely broad spectral range, allow us to observe both the Drude...
Strong correlations in low dimensional systems (2006)
I describe in these notes the physical properties of one dimensional interacting quantum particles. In one dimension the combined effects of interactions and quantum fluctuations lead to a radically...
Interacting Bose gases in quasi-one dimensional optical lattices (2006)
Cazalilla, M. A., Ho, A. F., Giamarchi, T.
We study a two-dimensional array of coupled one-dimensional (1D) tubes of interacting bosons. Such systems can be produced by loading ultra-cold atoms in anisotropic optical lattices. We investigate...
Deconfinement and cold atoms in optical lattices (2006)
Cazalilla, M. A., Ho, A. F., Giamarchi, T.
Despite the fact that by now one dimensional and three dimensional systems of interacting particles are reasonably well understood, very little is known on how to go from the one dimensional physics...
Spectroscopy of ultracold atoms by periodic lattice modulations (2006)
Kollath, C., Iucci, A., Giamarchi, T., Hofstetter, W., Schollwoeck, U.
We present a non-perturbative analysis of a new experimental technique for probing ultracold bosons in an optical lattice by periodic lattice depth modulations. This is done using the time-dependent...
Interacting fermions in self-similar potentials (2006)
Vidal, J., Mouhanna, D., Giamarchi, T.
We consider interacting spinless fermions in one dimension embedded in self-similar quasiperiodic potentials. We examine generalizations of the Fibonacci potential known as precious mean potentials....
Breakup of the Fermi surface near the Mott transition in low-dimensional systems (2006)
Berthod, C., Giamarchi, T., Biermann, S., Georges, A.
We investigate the Mott transition in weakly-coupled one-dimensional (1d) fermionic chains. Using a generalization of Dynamic Mean Field Theory, we show that the Mott gap is suppressed at some...
Coulombian Disorder in Periodic Systems (2006)
Orignac, Edmond, Rosso, Alberto, Chitra, R., Giamarchi, T.
We study the effect of unscreened charged impurities on periodic systems. We show that the long wavelength component of the disorder becomes long ranged and dominates static correlation functions. On...
Coulombian Disorder in Periodic Systems (2006)
Orignac, Edmond, Rosso, Alberto, Chitra, R., Giamarchi, T.
We study the effect of unscreened charged impurities on periodic systems. We show that the long wavelength component of the disorder becomes long ranged and dominates static correlation functions. On...
Dynamic Compressibility and aging in Wigner crystals and quantum glasses (2006)
Cugliandolo, L. F., Giamarchi, T., Doussal, P. Le
We study the non-equilibrium linear response of quantum elastic systems pinned by quenched disorder with Schwinger-Keldysh real-time techniques complemented by a mean-field variational approach. We...
Coulombian Disorder in Periodic Systems (2006)
Orignac, Edmond, Rosso, Alberto, Chitra, R., Giamarchi, T.
We study the effect of unscreened charged impurities on periodic systems. We show that the long wavelength component of the disorder becomes long ranged and dominates static correlation functions. On...
Disorder Effects in Fluctuating One-Dimensional Interacting Systems (2005)
London, U., Giamarchi, T., Orgad, D.
The zero temperature localization of interacting electrons coupled to a two-dimensional quenched random potential, and constrained to move on a fluctuating one-dimensional string embedded in the...
Dynamic Compressibility and aging in Wigner crystals and quantum glasses (2005)
Cugliandolo, L. F., Giamarchi, T., Doussal, P. Le
We study the non-equilibrium linear response of quantum elastic systems pinned by quenched disorder with Schwinger-Keldysh real-time techniques complemented by a mean-field variational approach. We...
Vortex pinning in high-temperature superconductors (2005)
Wagner, Orlando Sébastien Paulin, Blatter, J W, Giamarchi, T
Stability of the Bragg glass phase in a layered geometry (2005)
Carpentier, David, Doussal, P. Le, Giamarchi, T.
We study the stability of the dislocation-free Bragg glass phase in a layered geometry consisting of coupled parallel planes of d=1+1 vortex lines lying within each plane, in the presence of impurity...
Tunnelling in organic superconductors (2005)
We discuss the possibility of deciding on the symmetry of the superconducting phase in the organic superconductors (Bechgaard salts), using tunnelling experiments. We first briefly review the...
Energy absorption of a Bose gas in a periodically modulated optical lattice (2005)
Iucci, A., Cazalilla, M. A., Ho, A., Giamarchi, T.
We compute the energy absorbed by a one dimensional system of cold bosonic atoms in an optical lattice subjected to lattice amplitude modulation periodic with time. We perform the calculation for the...
Effects of weak disorder on two coupled Hubbard chains (2005)
We consider the effect of weak nonmagnetic disorder on two chains of interacting fermions (with and without spins) coupled by interchain hopping. For the spinless case, interchain hopping increases...
Effects of disorder on two strongly correlated coupled chains (2005)
We study the effects of disorder on a system of two coupled chains of strongly correlated fermions (the ladder system), using a renormalization-group technique. The stability of the phases of the...
Weakly disordered spin ladders (2005)
We analyze an anisotropic spin-1/2 two-leg ladder in the presence of various types of random perturbations. The generic phase diagram for the pure system, in a way similar to spin one chains,...
Vortices in coupled planes with columnar disorder and bosonic ladders (2005)
We consider two coupled strongly correlated bosonic chains. We derive the phase diagram of the pure system and obtain an antisymmetric charge density wave, a 4k_F charge density wave, a superfluid...
Adiabatic-antiadiabatic crossover in a spin-Peierls chain (2005)
Citro, R., Giamarchi, T., Orignac, Edmond
We consider an XXZ spin-1/2 chain coupled to optical phonons with non-zero frequency $\omega_0$. In the adiabatic limit (small $\omega_0$), the chain is expected to spontaneously dimerize and open a...
Orignac, Edmond, Giamarchi, T., Le Doussal, Pierre
We study the competition between a random potential and a commensurate potential on interacting fermionic and bosonic systems using a variety of methods. We focus on one-dimensional interacting...
A possible new phase of commensurate insulators with disorder: the Mott Glass (2005)
Orignac, Edmond, Giamarchi, T., Le Doussal, Pierre
A new thermodynamic phase resulting from the competition between a commensurate potential and disorder in interacting fermionic or bosonic systems is predicted. It requires interactions of finite...
Coulombian Disorder in Periodic Systems (2005)
Orignac, E., Rosso, A., Chitra, R., Giamarchi, T.
We study the effect of unscreened charged impurities on periodic systems. We show that the long wavelength component of the disorder becomes long ranged and dominates static correlation functions. On...
Dynamics of disordered elastic systems (2005)
Giamarchi, T., Kolton, A. B., Rosso, A.
We review in these notes some dynamical properties of interfaces in random media submitted to an external force. We focuss in particular to the response to a very small force (so called creep motion)...
Spin-1/2 fermions on spin-dependent optical lattices (2005)
Cazalilla, M. A., Ho, A. F., Giamarchi, T.
We study the phase diagram of one dimensional spin one-half fermionic cold atoms. The two ``spin'' species can have different hopping or mass. The phase diagram at equal densities of the species is...
Coulombian disorder in Charge Density Waves (2005)
Rosso, Alberto, Orignac, Edmond, Chitra, R., Giamarchi, T.
When unscreened charged impurities are introduced in charge density wave system the long wavelength component of the disorder is long ranged and dominates static correlation functions. We calculate...
Adiabatic-antiadiabatic crossover in a spin-Peierls chain (2005)
Citro, R., Giamarchi, T., Orignac, Edmond
We consider an XXZ spin-1/2 chain coupled to optical phonons with non-zero frequency $\omega_0$. In the adiabatic limit (small $\omega_0$), the chain is expected to spontaneously dimerize and open a...
Dynamic Compressibility and aging in Wigner crystals and quantum glasses (2005)
Cugliandolo, L. F., Giamarchi, T., Doussal, P. Le
We study the non-equilibrium linear response of quantum elastic systems pinned by quenched disorder with Schwinger-Keldysh real-time techniques complemented by a mean-field variational approach. We...
Adiabatic-antiadiabatic crossover in a spin-Peierls chain (2005)
Citro, R., Giamarchi, T., Orignac, Edmond
We consider an XXZ spin-1/2 chain coupled to optical phonons with non-zero frequency $\omega_0$. In the adiabatic limit (small $\omega_0$), the chain is expected to spontaneously dimerize and open a...
Domain wall roughness in epitaxial ferroelectric PbZr0.2Ti0.8O3 thin films (2004)
The static configuration of ferroelectric domain walls was investigated using atomic force microscopy on epitaxial PbZr0.2Ti0.8O3 thin films. Measurements of domain wall roughness reveal a power law...
Adiabatic-antiadiabatic crossover in a spin-Peierls chain (2004)
Citro, R., Orignac, E., Giamarchi, T.
We consider an XXZ spin-1/2 chain coupled to optical phonons with non-zero frequency $\omega_0$. In the adiabatic limit (small $\omega_0$), the chain is expected to spontaneously dimerize and open a...
Nanoscale studies of domain wall motion in epitaxial ferroelectric thin films (2004)
Paruch, P., Giamarchi, T., Tybell, T.
Atomic force microscopy was used to investigate ferroelectric switching and nanoscale domain dynamics in epitaxial PbZr0.2Ti0.8O3 thin films. Measurements of the writing time dependence of domain...
Keldysh study of point-contact tunneling between superconductors (2004)
We revisit the problem of point-contact tunnel junctions involving one-dimensional superconductors and present a simple scheme for computing the full current-voltage characteristics within the...
Dressel, M., Petukhov, K., Salameh, B., Zornoza, P., Giamarchi, T.
We report on dc and microwave experiments of the low-dimensional organic conductors (TMTSF)$_2$PF$_6$ and (TMTSF)$_2$ClO$_4$ along the $a$, $b^{\prime}$, and $c^*$ directions. In the normal state of...
Zero field Wigner crystal (2004)
A candidate for the insulating phase of the 2D electron gas, seen in high mobility 2D MOSFETS and heterojunctions, is a Wigner crystal pinned by the incipient disorder. With this in view, we study...
A short introduction to the physics and the method to treat quantum crystals of electrons (Wigner crystal) and the related disordered elastic systems.
Transport in Luttinger Liquids (2004)
Giamarchi, T., Nattermann, T., Doussal, P. Le
We compute the transport properties of one dimensional interacting electrons, also known as a Luttinger liquid. We show that a renormalization group study allows to obtain the temperature dependence...
Dimensional crossover and deconfinement in Bechgaard salts (2004)
Giamarchi, T., Biermann, S., Georges, A., Lichtenstein, A.
The Bechgaard salts are made of weakly coupled one dimensional chains. This particular structure gives the possibility to observe in these systems a dimensional crossover between a high temperature...
Deconfinement in a 2D optical lattice of coupled 1D boson systems (2003)
Ho, A. F., Cazalilla, M. A., Giamarchi, T.
We show that a two-dimensional (2D) array of 1D interacting boson tubes has a deconfinement transition between a 1D Mott insulator and a 3D superfluid for commensurate fillings and a dimensional...
Point-contact tunneling involving low-dimensional spin-triplet superconductors (2003)
We modify and extend previous microscopic calculations of tunneling in superconducting junctions based on a non-equilibrium Green function formalism to include the case of spin-triplet pairing. We...
Olive, E., Soret, J. C., Doussal, P. Le, Giamarchi, T.
We present 3D numerical simulation results of moving vortex lattices in presence of 1D correlated disorder at zero temperature. Our results with field tilting confirm the theoritical predictions of a...
Domain wall creep in epitaxial ferroelectric Pb(Zr0.2Ti0.8)O3 thin films (2002)
Tybell, T., Paruch, P., Giamarchi, T.
Ferroelectric switching and nanoscale domain dynamics were investigated using atomic force microscopy on monocrystalline Pb(Zr0.2Ti0.8)O3 thin films. Measurements of domain size versus writing time...
Quasi-one-dimensional organic conductors: dimensional crossover and some puzzles (2002)
Biermann, S., Georges, A., Giamarchi, T., Lichtenstein, A.
We review some properties of quasi-one-dimensional organic conductors, such as the Bechgaard salts, with an emphasis on aspects related to the crossovers between a Mott insulating state to a metallic...
Giamarchi, T., Bhattacharya, S.
These lecture notes are meant to provide a pedagogical introduction, and present the latest theoretical and experimental developments on the physics of vortices in type II superconductors.
A Bragg glass phase in the vortex lattice of a type II superconductor (2001)
Klein, T., Joumard, I., Blanchard, S., Marcus, J., Cubitt, R., Giamarchi, T., ...
Although crystals are usually quite stable, they are sensitive to a disordered environment: even an infinitesimal amount of impurities can lead to the destruction of the crystalline order. The...
Biermann, S., Georges, A., Lichtenstein, A., Giamarchi, T.
We investigate a system of one dimensional Hubbard chains of interacting fermions coupled by inter-chain hopping. Using a generalization of the Dynamical Mean Field Theory we study the deconfinement...
Interacting fermions in self-similar potentials (2001)
Vidal, J., Mouhanna, D., Giamarchi, T.
We consider interacting spinless fermions in one dimension embedded in self-similar quasiperiodic potentials. We examine generalizations of the Fibonacci potential known as precious mean potentials....
Giamarchi, T., Doussal, P. Le, Orignac, E.
We study the competition between a random potential and a commensurate potential on interacting fermionic and bosonic systems using a variety of methods. We focus on one dimensional interacting...