Tuesday, November 27, 2012

1211.6012 (Pedro Ribeiro et al.)

Strongly interacting bosons in multi-chromatic potentials supporting
mobility edges: localization, quasi-condensation and expansion dynamics

Pedro Ribeiro, Masudul Haque, Achilleas Lazarides
We provide an account of the static and dynamic properties of hard-core bosons in a one-dimensional lattice subject to a multi-chromatic quasiperiodic potential for which the single-particle spectrum has mobility edges. We use the mapping from strongly interacting bosons to weakly interacting fermions, and provide exact numerical results for hard-core bosons in and out of equilibrium. In equilibrium, we find that the system behaves like a quasi-condensate (insulator) depending on whether the Fermi surface of the corresponding fermionic system lies in a spectral region where the single-particle states are delocalized (localized). We also study non-equilibrium expansion dynamics of initially trapped bosons, and demonstrate that the extent of partial localization is determined by the single-particle spectrum.
View original: http://arxiv.org/abs/1211.6012

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