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[hal-01703570] Competing orders in the Hofstadter t–J model  (08/02/18)  
The Hofstadter model describes noninteracting fermions on a lattice in the presence of an external magnetic field. Motivated by the plethora of solid-state phases emerging from electron interactions, we consider an interacting version of the Hofstadter model, including a Hubbard repulsion U. We investigate this model in the large-U limit corresponding to a t–J Hamiltonian with an external (orbital) magnetic field. By using renormalized mean-field theory supplemented by exact diagonalization calculations of small clusters, we find evidence for competing symmetry-breaking phases, exhibiting (possibly coexisting) charge, bond, and superconducting orders. Topological properties of the states are also investigated, and some of our results are compared to related experiments involving ultracold atoms loaded on optical lattices in the presence of a synthetic gauge field.

[hal-01692501] Observation of Slow Dynamics near the Many-Body Localization Transition in One-Dimensional Quasiperiodic Systems  (26/01/18)  
[hal-01691955] Nearly Deconfined Spinon Excitations in the Square-Lattice Spin-1/2 Heisenberg Antiferromagnet  (25/01/18)  
[hal-01657695] Weak- versus strong-disorder superfluid—Bose glass transition in one dimension  (11/01/18)  
[hal-01641986] Vanishing Cycles and Cartan Eigenvectors  (28/02/18)  
[hal-01618835] Investigation of the chiral antiferromagnetic Heisenberg model using PEPS  (11/01/18)  
[hal-01618813] Entanglement properties of the two-dimensional SU(3) Affleck-Kennedy-Lieb-Tasaki state  (11/01/18)  
[hal-01587596] Quantum critical phase with infinite projected entangled paired states  (11/01/18)  
[hal-01529950] Spin-1/2 kagome XXZ model in a field: Competition between lattice nematic and solid orders  (11/01/18)  
[hal-01522773] Z2 antiferromagnetic topological insulators with broken C4 symmetry  (11/01/18)  
[hal-01513074] Local injection of pure spin current generates electric current vortices  (11/01/18)  
[hal-01493978] Incommensurate charge ordered states in the t–t'–J model  (24/01/18)  
[hal-01478853] Nuclear Magnetic Resonance Reveals Disordered Level-Crossing Physics in the Bose-Glass Regime of the Br-Doped Ni(Cl1−xBrx)2−4SC(NH2)2 Compound at a High Magnetic Field  (11/01/18)  
[hal-01477571] Disorder-Induced Revival of the Bose-Einstein Condensation in Ni(Cl1−xBrx)2−4SC(NH2)2 at High Magnetic Fields  (11/01/18)  
[hal-01472182] Numerical study of magnetization plateaus in the spin-1/2 Heisenberg antiferromagnet on the checkerboard lattice  (11/01/18)  


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Mots clés

Basse dimension Green function Monte Carlo Correlations electroniques Electronic correlations Generalized quantum dimer models Strongly Correlated Electrons Low-dimensional systems Heisenberg antiferromagnet Magnetization curve Dimeres Quantum information Crticalite Effective model Spin liquids Monte Carlo quantique Fidelity approach to quantum phase transitions Dimers Monte-Carlo quantique Low dimension Magnetic-breakdown Green's function Monte Carlo Courbe d'aimantation Fidelity susceptibility Magnetic field Hubbard Luttinger liquids Modèle de Heisenberg Heisenberg model Quantum dimer models t-J model superconductivity magnetism Dirac spin liquid U1 Dirac spin liquid Champ magnétique Interactions Frustrated magnetism Variational Monte Carlo Modèle de Heisenberg de spin 1/2 Condensed Matter Chaines de spin Variational quantum Monte Carlo Lanczos method Layered organic metals Kagome Bose glass Cristaux electroniques Physique de la matière condensée Condensed matter physics Heisenberg Model Kagome lattice Numerical methods Lanczos Magnétisme quantique Méthodes numériques Gutzwiller projected fermionic variational wave functions Frustrated lattices Projected wave functions Criticality T-J model Ladders Quantum Monte Carlo Modele effectif Modèle effectif Désordre Orbital magnetism Fermions fortement correles Quantum criticality Modèles de dimères quantiques généralisés Criticalite Disorder Kagomé lattice Hamiltonien effectif Plateau d'aimantation Quantum magnetism Supraconductivité Antiferromagnetism Quantum Monte-Carlo Magnetisme Magnetization plateau Antiferromagnetic conductors Quantum antiferromagnets Quantum phase transition Valence bond crystals High-Tc Superconductivity Frustration Effective hamiltonian Gutzwiller projected wave functions Bosons de coeur dur Électrons fortement corrélés Isolant de Mott Hard-core bosons Magnetisation plateaux Plateaux d'aimantation Magnetization plateaux Magnetisme quantique Magnetic quantum oscillations Quantum dimer models t-J model Fidélité et transitions de phases quantiques Low dimensions Frustrated systems Mott insulator