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Tunable anisotropic superfluidity in an optical kagome superlattice | | Xue-Feng Zhang
; Tao Wang
; Sebastian Eggert
; Axel Pelster
; | | Date: |
8 May 2015 | | Abstract: | We study the phase diagram of the Bose-Hubbard model on the kagome lattice
with a broken sublattice symmetry. Such a superlattice structure can naturally
be created and tuned by changing the potential offset of one sublattice in the
optical generation of the frustrated lattice. The superstructure gives rise to
a rich quantum phase diagram, which is analyzed by combining Quantum Monte
Carlo simulations with the Generalized Effective Potential Landau Theory. Mott
phases with non-integer filling and a characteristic order along stripes are
found, which show a transition to a superfluid phase with an anisotropic
superfluid density. Surprisingly, the direction of the superfluid anisotropy is
changing between different symmetry directions as a function of the particle
number or the hopping strength. Finally, we discuss characteristic signatures
of anisotropic phases in time-of-flight absorption measurements. | | Source: | arXiv, 1505.1974 | | Services: | Forum | Review | PDF | Favorites | |
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