Zobrazeno 1 - 10
of 98
pro vyhledávání: '"Rousseau, V. G."'
Publikováno v:
Phys. Rev. A 100, 033608 (2019)
We study the ground state phase diagrams of two-photon Dicke, the one-dimensional Jaynes-Cummings-Hubbard (JCH), and Rabi-Hubbard (RH) models using mean field, perturbation, quantum Monte Carlo (QMC), and density matrix renormalization group (DMRG) m
Externí odkaz:
http://arxiv.org/abs/1904.05258
Publikováno v:
Phys. Rev. B 99, 075108 (2019)
The Hubbard-Holstein model describes fermions on a discrete lattice, with on-site repulsion between fermions and a coupling to phonons that are localized on sites. Generally, at half-filling, increasing the coupling $g$ to the phonons drives the syst
Externí odkaz:
http://arxiv.org/abs/1811.07811
Publikováno v:
Phys. Rev. B 98, 184206 (2018)
We study the Bose-Hubbard model in the presence of on-site disorder in the canonical ensemble and conclude that the local density of the Bose glass phase behaves differently at incommensurate filling than it does at commensurate one. Scaling of the s
Externí odkaz:
http://arxiv.org/abs/1711.06310
Publikováno v:
Phys. Rev. B 95, 144501 (2017)
High-finesse optical cavity allows the establishment of long-range interactions between bosons in an optical lattice when most cold atoms experiments are restricted to short-range interactions. Supersolid phases have recently been experimentally obse
Externí odkaz:
http://arxiv.org/abs/1701.01624
Publikováno v:
Phys. Rev. B 94, 144514 (2016)
Ring-exchange interactions have been proposed as a possible mechanism for a Bose-liquid phase at zero temperature, a phase that is compressible with no superfluidity. Using the Stochastic Green Function algorithm (SGF), we study the effect of these i
Externí odkaz:
http://arxiv.org/abs/1607.04189
Publikováno v:
Eur. Phys. J. D {\bf 70}, 213 (2016)
We study, using quantum Monte Carlo (QMC) simulations, the ground state properties of a one dimensional Rabi-Hubbard model. The model consists of a lattice of Rabi systems coupled by a photon hopping term between near neighbor sites. For large enough
Externí odkaz:
http://arxiv.org/abs/1603.01126
Publikováno v:
Phys. Rev. B 92, 035101 (2015)
We study, using quantum Monte-Carlo simulations, the bosonic Kondo-Hubbard model in a two dimensional square lattice. We explore the phase diagram and analyse the mobility of particles and magnetic properties. At unit filling, the transition from a p
Externí odkaz:
http://arxiv.org/abs/1502.06202
Publikováno v:
Phys. Rev. B 90, 205123 (2014)
We study the phase diagram of the one-dimensional bosonic Hubbard model with contact ($U$) and near neighbor ($V$) interactions focusing on the gapped Haldane insulating (HI) phase which is characterized by an exotic nonlocal order parameter. The par
Externí odkaz:
http://arxiv.org/abs/1405.5382
Autor:
Rousseau, V. G.
Publikováno v:
Phys. Rev. B 90, 134503 (2014)
We review the concept of superfluidity and, based on real and thought experiments, we use the formalism of second quantization to derive expressions that allow the calculation of the superfluid density for general Hamiltonians with path-integral meth
Externí odkaz:
http://arxiv.org/abs/1403.5472
Publikováno v:
Phys. Rev. B 88, 104509 (2013)
We study, using quantum Monte Carlo (QMC) simulations, the ground state properties of spin-1 bosons trapped in a square optical lattice. The phase diagram is characterized by the mobility of the particles (Mott insulating or superfluid phase) and by
Externí odkaz:
http://arxiv.org/abs/1306.5515