Thielemann, B., Rüegg, Ch., Kiefer, K., Rønnow, H. M., Bouillot, P., Kollath, C., ...
The transition from a magnetic field-tuned spin Luttinger-liquid with algebraic spin correlations to a Bose-Einstein Condensate of magnons with long-range magnetic order is investigated in the...
Controlling Luttinger liquid physics in spin ladders under a 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) consisting of weakly coupled spin-1/2 Heisenberg antiferromagnetic ladders. Treating ladders in the...
Phase diagram and momentum distribution of an interacting Bose gas in a bichromatic lattice (2008)
Deng, Xiaolong, Citro, R., Minguzzi, A., Orignac, E.
We determine the phase diagram and the momentum distribution for a one-dimensional Bose gas with repulsive short range interactions in the presence of a two-color lattice potential, with...
The low-energy excitation spectrum of one-dimensional dipolar quantum gases (2008)
De Palo, S., Orignac, E., Citro, R., Chiofalo, M. L.
We determine the excitation spectrum of a bosonic dipolar quantum gas in a one-dimensional geometry, from the dynamical density-density correlation functions simulated by means of Reptation Quantum...
Collective excitations of trapped one-dimensional dipolar quantum gases (2007)
Pedri, P., De Palo, S., Orignac, E., Citro, R., Chiofalo, M. L.
We calculate the excitation modes of a 1D dipolar quantum gas confined in a harmonic trap with frequency $\omega_0$ and predict how the frequency of the breathing n=2 mode characterizes the...
Diamagnetism of doped two-leg ladders and probing the nature of their commensurate phases (2007)
Roux, G., Orignac, E., White, S. R., Poilblanc, D.
We study the magnetic orbital effect of a doped two-leg ladder in the presence of a magnetic field component perpendicular to the ladder plane. Combining both low-energy approach (bosonization) and...
Orignac, E., Citro, R., Capponi, S., Poilblanc, D.
Recent experiments have revealed the role of staggered Dzialoshinskii-Moriya interaction in the magnetized phase of an antiferromagnetic spin 1/2 two-leg ladder compound under a uniform magnetic...
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...
Resonant magnetic mode in superconducting 2-leg ladders (2007)
Poilblanc, D., Orignac, E., White, S. R., Capponi, S.
The spin dynamics of a doped 2-leg spin ladder is investigated by numerical techniques. We show that a hole pair-magnon boundstate evolves at finite hole doping into a sharp magnetic excitation below...
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...
Evidence of Luttinger liquid behavior in one-dimensional dipolar quantum gases (2006)
Citro, R., Orignac, E., De Palo, S.
The ground state and structure of a one-dimensional Bose gas with dipolar repulsions is investigated at zero temperature by a combined Reptation Quantum Monte Carlo (RQMC) and bosonization approach....
Roux, G., Orignac, E., Pujol, P., Poilblanc, D.
We review the properties of two coupled fermionic chains, or ladders, under a magnetic field parallel to the lattice plane. Results are computed by complementary analytical (bosonization) and...
Critical behaviour of a spin-tube model in a magnetic field (2005)
Citro, R., Orignac, E., Andrei, N., Itoi, C., Qin, S.
We show that the low-energy physics of the spin-tube model in presence of a critical magnetic field can be described by a broken SU(3) spin chain. Using the Lieb-Schultz-Mattis Theorem we...
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...
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...
Atom-molecule coherence in a one-dimensional system (2005)
We study a model of one-dimensional fermionic atoms that can bind in pairs to form bosonic molecules. We show that at low energy, a coherence develops between the molecule and fermion Luttinger...
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...
Magnetostriction in an array of spin chains under magnetic field (2004)
We consider an array of XX spin-1/2 chains coupled to acoustic phonons and placed in a magnetic field. Treating the phonons in the mean field approximation, we show that this system presents a first...
Mean Field theory of the spin-Peierls transition (2004)
We revisit the problem of the spin-Peierls instability in a one dimensional spin-1/2 chain coupled to phonons. The phonons are treated within the mean field approximation. We use bosonization...
Resonant magnetic mode in superconducting 2-leg ladders (2004)
Poilblanc, D., Orignac, E., White, S. R., Capponi, S.
The spin dynamics of a doped 2-leg spin ladder is investigated by numerical techniques. We show that a hole pair-magnon boundstate evolves at finite hole doping into a sharp magnetic excitation below...
Z_3 Quantum Criticality in a spin-1/2 chain model (2003)
The stability of the magnetization $m=1/3$ plateau phase of the XXZ spin-1/2 Heisenberg chain with competing interactions is investigated upon switching on a staggered transverse magnetic field....
Charge Density Waves and Bond Order Waves in a quarter filled extended Hubbard ladder (2003)
We investigate the phase diagram of a quarter filled Hubbard ladder with nearest-neighbor Coulomb repulsion using bosonization and renormalization group approach. Focusing on the strong-repulsion...
Thermal transport in one-dimensional spin gap systems (2002)
Orignac, E., Chitra, R., Citro, R.
We study thermal transport in one dimensional spin systems both in the presence and absence of impurities. In the absence of disorder, all these spin systems display a temperature dependent Drude...
Disordered Quantum smectics (2002)
We study the impurity pinning of the Quantum Hall (QH) smectic state arising in two dimensional electron systems in high Landau levels. We use replicas and a Gaussian Variational method to deal with...
Heat conduction and Wiedemann-Franz Law in disordered Luttinger Liquids (2002)
We consider heat transport in a Luttinger liquid (LL) with weak disorder and study the Lorenz number for this system. We start at a high-$T$ regime, and calculate both the electrical and thermal...
Magnetization and dimerization profiles of the cut two-leg spin ladder and spin-1 chain (2001)
The physical properties of the edge states of the cut two-leg spin ladder are investigated by means of the bosonization approach. By carefully treating boundary conditions, we derive the existence of...
Ising transition in a one-dimensional quarter-filled electron system with dimerization (2001)
We examine critical properties of the quarter-filled one-dimensional Hubbard model with dimerization and with the onsite and nearest-neighbor Coulomb repulsion U and V. By utilizing the bosonization...
Effects of anisotropic spin-exchange interactions in spin ladders (2001)
We investigate the effects of the Dzialoshinskii-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions on various thermodynamic and magnetic properties of a spin 1/2 ladder....
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...
Competition of disorder and interchain hopping in a two-chain Hubbard model (2001)
We study the interplay of Anderson localization and interaction in a two chain Hubbard ladder allowing for arbitrary ratio of disorder strength to interchain coupling. We obtain three different types...
Raman Scattering from Magnetic Excitations in coupled Spin Ladders (2000)
We consider Raman scattering of coupled two leg spin ladders in the Fleury-Loudon regime. We derive the dependence of the intensity with polarization of the incoming light and temperature and discuss...
Meissner effect in a bosonic ladder (2000)
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 (2000)
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...
Disordered Quantum Solids (2000)
Due to the peculiar non-fermi liquid of one dimensional systems, disorder has particularly strong effects. We show that such systems belong to the more general class of disordered quantum solids. We...
Raman Scattering cross section of Spin Ladders (2000)
The Raman scattering spectra from magnetic excitations in an antiferromagnetic spin-1/2 two leg ladder is investigated for weak and strong interladder coupling. In the first case, a cusp in the Raman...
Magnetism and superconductivity in underscreened Kondo chains (2000)
We present a one dimensional model of electrons coupled to localized moments of spin $S\ge 1$ in which magnetism and superconductivity interplay in a nontrivial manner. This model has a non-Fermi...
Low energy dynamics of the one dimensional multichannel Kondo-Heisenberg Lattice (1999)
We determine exactly the fixed point Hamiltonian of the one dimensional multichannel Kondo-Heisenberg lattice model for any number of channels N>=2. An anomalous singlet with non trivial internal...
Low-energy behavior of the spin-tube and spin-orbital models (1999)
Orignac, E., Citro, R., Andrei, N.
The low-energy effective Hamiltonian of three coupled spin chains with periodic boundary conditions (spin tube) is expressed, in the limit of strong interchain coupling, in terms of XXZ chains...
Critical behaviour of a spin-tube model in a magnetic field (1999)
Citro, R., Orignac, E., Andrei, N., Itoi, C., Qin, S.
We show that the low-energy physics of the spin-tube model in presence of a critical magnetic field can be described by a broken SU(3) spin chain. Using the Lieb-Schultz-Mattis Theorem we...
A possible new phase of commensurate insulators with disorder: the Mott Glass (1999)
Orignac, E., Giamarchi, T., Doussal, P. Le
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...
Critical behaviour of a spin-tube model in a magnetic field (1999)
Citro, R., Orignac, E., Andrei, N., Itoi, C., Qin, S.
We show that the low-energy physics of the spin-tube model in presence of a critical magnetic field can be described by a broken SU(3) spin chain. Using the Lieb-Schultz-Mattis Theorem we...
Critical behaviour of a spin-tube model in a magnetic field (1999)
Citro, R., Orignac, E., Andrei, N., Itoi, C., Qin, S.
We show that the low-energy physics of the spin-tube model in presence of a critical magnetic field can be described by a broken SU(3) spin chain. Using the Lieb-Schultz-Mattis Theorem we...
Anderson localization in Hubbard ladders (1998)
The effect of a weak random potential on two-leg Hubbard ladders is investigated. The random potential is shown to induce Anderson localization except for attractive enough interactions, supressing...
Vortices in coupled planes with columnar disorder and bosonic ladders (1998)
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...
Effects of weak disorder on two coupled Hubbard chains (1998)
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 (1998)
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 (1998)
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 (1998)
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...
Effects of weak disorder on two coupled Hubbard chains (1998)
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 (1998)
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 (1998)
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 (1998)
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...
Weakly disordered spin ladders (1997)
We analyze an anisotropic spin 1/2 two legs ladder in the presence of various type of random perturbations. The generic phase diagram for the pure system, in a way similar to spin one chains,...
Effects of disorder on two strongly correlated coupled chains (1997)
We study the effects of disorder on a system of two coupled chain of strongly correlated fermions (ladder system), using renormalization group. The stability of the phases of the pure system is...
Effects of a weak disorder on two coupled Hubbard chains (1995)
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...