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Condensed Matter > Quantum Gases

arXiv:1306.5608 (cond-mat)
[Submitted on 24 Jun 2013]

Title:Density dependent tunneling in the extended Bose-Hubbard model

Authors:Michal Maik, Philipp Hauke, Omjyoti Dutta, Jakub Zakrzewski, Maciej Lewenstein
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Abstract:Recently, it has become apparent that, when the interactions between polar molecules in optical lattices becomes strong, the conventional description using the extended Hubbard model has to be modified by additional terms, in particular a density-dependent tunneling term. We investigate here the influence of this term on the ground-state phase diagrams of the two dimensional extended Bose-Hubbard model. Using Quantum Monte Carlo simulations, we investigate the changes of the superfluid, supersolid, and phase-separated parameter regions in the phase diagram of the system. By studying the interplay of the density-dependent hopping with the usual on-site interaction U and nearest-neighbor repulsion V, we show that the ground-state phase diagrams differ significantly from the ones that are expected from the standard extended Bose-Hubbard model. However we find no indication of pair-superfluid behavior in this two dimensional square lattice study in contrast to the one-dimensional case.
Subjects: Quantum Gases (cond-mat.quant-gas)
Cite as: arXiv:1306.5608 [cond-mat.quant-gas]
  (or arXiv:1306.5608v1 [cond-mat.quant-gas] for this version)
  https://doi.org/10.48550/arXiv.1306.5608
Journal reference: New J. Phys. 15, 113041 (2013)
Related DOI: https://doi.org/10.1088/1367-2630/15/11/113041

Submission history

From: Michal Maik [view email]
[v1] Mon, 24 Jun 2013 13:16:24 UTC (1,219 KB)
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