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Dynamic Stimulation of Phase Coherence in Lattice Bosons

Andrew J. Robertson, Victor M. Galitski, Gil Refael

Bulletin of the American Physical SocietyMar 22, 20110 citations

Disorder-enhanced phase coherence in trapped bosons on optical lattices

Pinaki Sengupta, Aditya Raghavan, Stephan Haas

The consequences of disorder on interacting bosons trapped in one-dimensional optical lattices are investigated by quantum Monte Carlo simulations. A numerical analysis of the momentum distribution function, the stiffness and the compressibility reveals a unique response to small to moderate strengths of potential disorder. If there is a Mott plateau at the centre of the trap in the clean limit, phase coherence increases as a result of disorder. The localization effects due to correlation and disorder compete against each other, resulting in a partial delocalization of the particles in the Mott region, which in turn leads to increased phase coherence. In the absence of a Mott plateau, this effect is absent. A detailed analysis of the uniform system without a trap shows that the disordered states participate in a Bose glass phase.The consequences of disorder on interacting bosons trapped in one-dimensional optical lattices are investigated by quantum Monte Carlo simulations. A numerical analysis of the momentum distribution function, the stiffness and the compressibility reveals a unique response to small to moderate strengths of potential disorder. If there is a Mott plateau at the centre of the trap in the clean limit, phase coherence increases as a result of disorder. The localization effects due to correlation and disorder compete against each other, resulting in a partial delocalization of the particles in the Mott region, which in turn leads to increased phase coherence. In the absence of a Mott plateau, this effect is absent. A detailed analysis of the uniform system without a trap shows that the disordered states participate in a Bose glass phase.

arXiv:cond-mat/0602504New Journal of PhysicsApr 25, 200716 citations

Mean-field description of ultracold Bosons on disordered two-dimensional optical lattices

Pierfrancesco Buonsante, Francesco Massel, Vittorio Penna +1 more

Abstract. In the present paper we describe the properties induced by disorder on an ultracold gas of Bosonic atoms loaded into a two-dimensional optical lattice with global confinement ensured by a parabolic potential. Our analysis is centered on the spatial distribution of the various phases, focusing particularly on the superfluid properties of the system as a function of external parameters and disorder amplitude. In particular, it is shown how disorder can suppress superfluidity, while partially preserving the system coherence.Abstract. In the present paper we describe the properties induced by disorder on an ultracold gas of Bosonic atoms loaded into a two-dimensional optical lattice with global confinement ensured by a parabolic potential. Our analysis is centered on the spatial distribution of the various phases, focusing particularly on the superfluid properties of the system as a function of external parameters and disorder amplitude. In particular, it is shown how disorder can suppress superfluidity, while partially preserving the system coherence.

Jan 1, 20078 citations

Disorder-induced quantum phenomena in inhomogeneous optical lattices

Masaru Sakaida

Mar 23, 20160 citations

Bosons in Disordered Optical Potentials

Pearl J. Y. Louis, Makoto Tsubota

arXiv:cond-mat/0609195Journal of Low Temperature PhysicsMay 25, 20077 citations

Mean-field description of ultracold bosons on disordered two-dimensional optical lattices

Pierfrancesco Buonsante, Francesco Massel, Vittorio Penna +1 more

In the present communication, we describe the properties induced by disorder on an ultracold gas of bosonic atoms loaded into a two-dimensional optical lattice with global confinement ensured by a parabolic potential. Our analysis is centred on the spatial distribution of the various phases, focusing particularly on the superfluid properties of the system as a function of external parameters and disorder amplitude. In particular, it is shown how disorder can suppress superfluidity, while partially preserving the system coherence.In the present communication, we describe the properties induced by disorder on an ultracold gas of bosonic atoms loaded into a two-dimensional optical lattice with global confinement ensured by a parabolic potential. Our analysis is centred on the spatial distribution of the various phases, focusing particularly on the superfluid properties of the system as a function of external parameters and disorder amplitude. In particular, it is shown how disorder can suppress superfluidity, while partially preserving the system coherence.

arXiv:0707.4113Journal of Physics B Atomic Molecular and Optical PhysicsAug 28, 20079 citations

Disorder-induced enhancement of phase coherence in trapped bosons on optical lattices

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