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arXiv 1301.6871cond-mat.quant-gas
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双层光晶格中自旋-轨道耦合费米气体的Phase Diagram

Phase Diagram of a Spin-Orbit Coupled Fermi Gases in a Bilayer Optical Lattice

Xiaosen Yang, Beibing Huang, Hai-Qing Lin

摘要:

研究了双层光晶格中自旋轨道耦合费米气体中螺旋超流相的稳定性。在平均场框架下构造了系统的相图。我们调查的拓扑性质的超流相的费米表面拓扑不变量的非平凡应用我们的时间反演不变系统的费米表面上的退化。我们发现在半满情况下的相图中存在一级相边界,并且超流相都是拓扑平凡的。当填充分数偏离半填充时,超流相是拓扑非平凡的。在拓扑非平凡的超流相,一个完整的配对间隙存在于体和无间隙的螺旋Majorana边缘状态存在于边界处。

英文摘要:

We investigate the stability of helical superfluid phase in a spin-orbit coupled Fermi gas loaded in a bilayer optical lattice. The phase diagram of the system is constructed in the mean field framework. We investigate the topological properties of the superfluid phases by a nontrivial application of the Fermi surface topological invariant to our time-reversal invariant system with degeneracies on the Fermi surface. We find that there is a first-order phase boundary in the phase diagram of half filling case and the superfluid phases are all topological trivial. The superfluid phase is topological nontrivial when the filling fraction deviates from the half filling. In the topological nontrivial superfluid phase, a full pairing gap exists in the bulk and gapless helical Majorana edge states exist at the boundary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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