Topologically induced avoided band crossing in an optical chequerboard lattice
Quantum Gases
2012-11-13 v2 Quantum Physics
Abstract
We report on the condensation of bosons in the 4th band of an optical chequerboard lattice providing a topologically induced avoided band crossing involving the 2nd, 3rd, and 4th Bloch bands. When the condensate is slowly tuned through the avoided crossing, accelerated band relaxation arises and the zero momentum approximately -invariant condensate wave function acquires finite momentum order and reduced symmetry. For faster tuning Landau-Zener oscillations between different superfluid orders arise, which are used to characterize the avoided crossing.
Keywords
Cite
@article{arxiv.1110.3716,
title = {Topologically induced avoided band crossing in an optical chequerboard lattice},
author = {Matthias Ölschläger and Georg Wirth and Thorge Kock and Andreas Hemmerich},
journal= {arXiv preprint arXiv:1110.3716},
year = {2012}
}
Comments
4 figs, Final version to appear in Phys. Rev. Lett