Seminar
Tuesday, 27 July, 2010
Group seminar LMU: Orbital phases of the optical lattice p-band
Tuesday, 27.07.2010 10 a.m. (s.t.) in H107, Fakultät für Physik LMU
Prof. W. Vincent Liu, University of Pittsburgh, Pennsylvania, USA
The p-orbital band of optical lattices is a topic that emerged in recent few years of theoretical studies. Experimental observations of p-band BEC (reported by T. Mueller et al 2007 and G. Wirth et al 2010) make this topic an exciting one. In this talk, I will first try to explain why the system of ultracold particles in the lattice p-bands is conceptually intriguing and unique to cold atomic gases. Then I will report some interesting new quantum orbital phases that we have found, such as finite-momentum px+ipy Bose-Einstein condensates, staggered orbital currents, stripes of angular momenta, and incommensurate super-current density wave, as well as the realization of some condensed matter orbital models such as the quantum 120 degree model and the quantum dimer model.
Work done in collaboration with J. Moore, S. Das Sarma, K. Sun, V. M. Stojanovic, C. Wu, and E. Zhao.
References:
[1] W. V. Liu, C. Wu, Phys. Rev. A 74, 013607 (2006).
[2] C. Wu, W. V. Liu, J. Moore, S. Das Sarma, Phys. Rev. Lett. 97, 190406 (2006).
[3] V. M. Stojanovic, C. Wu, W. V. Liu, S. Das Sarma, Phys. Rev. Lett. 101, 125301 (2008).
[4] E. Zhao and W. V. Liu, Phys. Rev. Lett. 100, 160403 (2008).
[5] K. Sun, E. Zhao, W. V. Liu. Phys. Rev. Lett. 104, 165303 (2010).
[6] Z. Zhang, H.-H. Hung, C. M. Ho, E. Zhao, W. V. Liu, arXiv:0910.2431