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Generalized Effective Potential Landau Theory for Bosonic Quadratic Superlattices | | Tao Wang
; Xue-Feng Zhang
; Sebastian Eggert
; Axel Pelster
; | | Date: |
9 Apr 2013 | | Abstract: | We study the properties of the Bose-Hubbard model for a quadratic optical
superlattice. To this end we generalize a recently established effective
potential Landau theory for a single component to the case of multi components
and find not only the characteristic incompressible solid phases with
fractional filling, but also obtain the underlying quantum phase diagram in the
whole parameter region at zero temperature. Comparing our analytic results with
corresponding ones from quantum Monte Carlo simulations demonstrates the high
accuracy of the generalized effective potential Landau theory (GEPLT). Finally,
we comment on the advantages and disadvantages of the GEPLT in view of a direct
comparison with a corresponding decoupled mean-field theory. | | Source: | arXiv, 1304.2634 | | Services: | Forum | Review | PDF | Favorites | |
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