Fermionic superfluidity and spontaneous superflows in optical lattices
Fermionic superfluidity and spontaneous superflows in optical lattices
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DOI：
10.1088/1367-2630/12/2/023032
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发表时间：
2010-02
影响因子：
3.3
通讯作者：
Shi-jie Yang;S. Feng
中科院分区：
文献类型：
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作者：
Shi-jie Yang;S. Feng
我们研究了光学晶格中强排斥费米子原子的超流性。原子通过相关的隧道机制配对，当哈伯德模型中包含排斥性最近邻相互作用时，该机制会产生超流动性。这种配对超流体是一种亚稳态，由于配对断裂过程受到严重抑制，这种状态会持续很长时间。在方晶格系统中研究了平均场相图和低能激发。有趣的是，由于反铁磁挫败，自发超流可能出现在三角形光学晶格系统的基态中。
We studied the superfluidity of strongly repulsive fermionic atoms in optical lattices. Atoms are paired through a correlated tunneling mechanism, which induces superfluidity when repulsive nearest-neighbor interactions are included in the Hubbard model. This paired superfluid is a metastable state, which persists for a long time as the pair-broken process is severely suppressed. The mean-field phase diagram and low-energy excitations are investigated in a square lattice system. Intriguingly, spontaneous superflows may appear in the ground state of a triangular optical lattice system due to antiferromagnetic frustration.