Three-component topological superfluid in one-dimensional Fermi gases with spin-orbit coupling
Three-component topological superfluid in one-dimensional Fermi gases with spin-orbit coupling
复制标题
自旋轨道耦合一维费米气体中的三组分拓扑超流体
DOI：
10.1103/physreva.90.023619
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发表时间：
2014-05
期刊：
影响因子：
--
通讯作者：
Gao Xianlong
中科院分区：
文献类型：
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作者：
Jie Chen;Gao Xianlong
我们从理论上研究了存在塞曼场的一维三分量自旋轨道耦合费米气体。通过求解Bogoliubov-de-Gennes方程，我们得到了给定化学势和有序参数下的相图。我们表明，随着塞曼场强度的增加，系统经历了从 Bardeen-Cooper-Schrieffer 超流体到拓扑超流体的相变。通过与二元体系的比较，我们发现，除了从平凡超流体到非平凡拓扑超流体的拓扑相变之外，系统始终处于非平凡拓扑超流体，并且在增加磁场的同时存在两个马约拉纳零能量区。我们发现，由于所需的磁场较小，三组分自旋轨道耦合费米气体在一定参数范围内更适合实验实现。因此，我们提出了一种有希望实现拓扑超流体的候选方案。
We theoretically investigate one-dimensional three-component spin-orbit-coupled Fermi gases in the presence of Zeeman field. By solving the Bogoliubov-de-Gennes equations, we obtain the phase diagram at given chemical potential and order parameter. We show that the system undergoes a phase transition from Bardeen-Cooper-Schrieffer superfluid to topological superfluid as increasing the intensity of Zeeman field. By comparing to the two-component system, we find, besides the topological phase transition from the trivial superfluid to nontrivial topological superfluid, the system can always be in a nontrivial topological superfluid, and there are two Majorana zero energy regions while increasing the magnetic field. We find the three-component spin-orbit-coupled Fermi gases in certain parameter range is more optimizing for experimental realization due to the smaller magnetic field needed. We therefore propose a promising candidate for realizing topological superfluid.