Topological px + i py superfluid phase of a dipolar Fermi gas in a two-dimensional optical lattice
Topological px + i py superfluid phase of a dipolar Fermi gas in a two-dimensional optical lattice
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DOI：
10.1103/physreva.86.031603
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发表时间：
2012-09-17
影响因子：
2.9
通讯作者：
Yin, Lan
中科院分区：
文献类型：
--
作者：
Liu, Bo;Yin, Lan
在偶极费米气体中，电偶极子之间的各向异性相互作用在旋转电场的存在下可以转化为有效的吸引相互作用。我们发现，拓扑p（x）+ ip（y）超流相可以实现在一个单组分偶极费米气体被困在一个二维正方形光学晶格与这种吸引力的相互作用在低温下。p（x）+ ip（y）超流态在拓扑量子计算中有潜在的应用。我们得到了该体系在零温时的相图。当相互作用较弱时，p波超流态在大多数填充因子下是稳定的，除了在接近半填充时发生相分离。在弱耦合极限，相分离区消失。当相互作用强度高于阈值时，对于任何填充因子0 < n < 1，系统是相分离的。对p（x）+ ip（y）超流态的转变温度进行了估计，并讨论了实验意义。
In a dipolar Fermi gas, the anisotropic interaction between electric dipoles can be turned into an effectively attractive interaction in the presence of a rotating electric field. We show that the topological p(x) + ip(y) superfluid phase can be realized in a single-component dipolar Fermi gas trapped in a two-dimensional square optical lattice with this attractive interaction at low temperatures. The p(x) + ip(y) superfluid state has potential applications for topological quantum computing. We obtain the phase diagram of this system at zero temperature. When the interaction is weak, the p-wave superfluid state is stable for most filling factors except near half filling, where phase separation takes place. In the weak-coupling limit, the phase-separation region vanishes. When the interaction strength is above a threshold, the system is phase separated for any filling factor 0 < n < 1. The transition temperature of the p(x) + ip(y) superfluid state is estimated and the implication for experiments is discussed.