Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 43: Ultra-cold atoms, ions and BEC II

Q 43.3: Vortrag

Donnerstag, 15. März 2012, 11:00–11:15, V47.02

Quantum phases of Bose-Bose mixtures in a triangular lattice — •Liang He1, Yongqiang Li1, Sebastian D. Huber2, and Walter Hofstetter11Institut für Theoretische Physik, Goethe Universität Frankfurt (Main), Germany — 2Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel

Geometric frustration arises when magnetic interactions between different spins on a lattice are incompatible with the underlying crystal geometry. Motivated by recent experimental progress in making non-bipartite optical lattices [1], we investigate the zero-temperature quantum phases of a Bose-Bose mixture in a triangular lattice, using bosonic dynamical mean field theory (BDMFT) [2]. We map out the ground state phase diagram of the system which contains spin-ordered phases, weak charge density wave, superfluid, and supersolid phases. The effects of geometric frustration on the spin-ordered phases and phase transitions between different spin-ordered phases are also discussed.

[1] C. Becker et al., New J. Phys. 12, 065025 (2010); W. S. Bakr et al., Science 329, 547 (2010); Gyu-Boong Jo et al., arXiv:1109.1591.

[2] K. Byczuk et al., Phys. Rev. B 77, 235106 (2008); A. Hubener et al., Phys. Rev. B 80, 245109 (2009); W. J. Hu et al., Phys. Rev. B 80, 245110 (2009); Y. Li et al., Phys. Rev. B 84, 144411 (2011).

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