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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.28: Poster
Thursday, March 21, 2013, 16:00–18:30, Empore Lichthof
Anisotropic superfluidity of bosons in optical Kagome superlattice — Tao Wang1,2, Xue-Feng Zhang1, •Axel Pelster1, and Sebastian Eggert1 — 1Fachbereich Physik, Technische Universität Kaiserslautern, Germany — 2Harbin Insititute of Technology, Harbin, China
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 [1]. To this end we combine the virtues of a Mean-Field theory with the Laudau theory of Ref. [2] and work out a multi-component 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, reveals its tensional property [3]. Finally, we discuss the complete quantum phase diagram.
[1] G.-B. Jo, J. Guzman, C. K. Thomas, P. Hosur, A. Vishwanath, and D. M. Stamper-Kurn, Phys. Rev. Lett. 108, 045305 (2012)
[2] F. E. A. dos Santos and A. Pelster, Phys. Rev. A 79, 013614 (2009)
[3] M. Ueda, Fundamentals and New Frontiers of Bose-Einstein Condensation (World Scientific, Singapore, 2010)