Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.85: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Anisotropic superfluidity of bosons in optical Kagome superlattice — •Xuefeng Zhang1, Tao Wang1, Axel Pelster2, and Sebastian Eggert1 — 1Department of the Physics,Univ. Kaiserslautern, Kaiserslautern, Germany — 2Hanse-Wissenschaftskolleg, Germany
We study the quantum phase transitions for the extended Bose-Hubbard model with bosons on a Kagome superlattice which can be implemented by enhancing the long wavelength laser in one direction of the optical lattice. To this end we combine the virtues of a Mean-Field theory with the Laudau theory and work out of a decoupled effective potential method by comparing the corresponding analytic results with extensive quantum Monte Carlo simulations, we find that several striped solids emerge in this system. Due to the blockade effect of such a striped order, the resulting superfluid density turns out to be anisotropic and thus, reveal its tensional property. Finally, we discuss the complete quantum phase diagram.