Topologically induced avoided band crossing in an optical checkerboard lattice.
Topologically induced avoided band crossing in an optical checkerboard lattice.
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DOI：
10.1103/physrevlett.108.075302
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发表时间：
2011-10
影响因子：
8.6
通讯作者：
Matthias Olschläger;G. Wirth;T. Kock;A. Hemmerich
中科院分区：
文献类型：
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作者：
Matthias Olschläger;G. Wirth;T. Kock;A. Hemmerich
我们报道了在光学棋盘格晶格的第4带中玻色子的凝聚，提供了涉及第2，第3和第4 Bloch带的拓扑诱导避免带交叉。当凝聚体通过避免的交叉缓慢调谐时，产生加速带弛豫，零动量近似c4不变凝聚波函数获得有限动量阶和降低的C2对称性。为了更快地调谐，出现了不同超流体阶间的朗道-齐纳振荡，用来表征避免的交叉。
We report on the condensation of bosons in the 4th band of an optical checkerboard 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 C4-invariant condensate wave function acquires finite momentum order and reduced C2 symmetry. For faster tuning Landau-Zener oscillations between different superfluid orders arise, which are used to characterize the avoided crossing.