Phase Diagram of a Spin-Orbit Coupled Dipolar Fermi Gas at T =0K
Xue-Jing Feng, Lan Yin**
School of Physics, Peking University, Beijing 100871
Abstract ：We study a homogeneous two-component dipolar Fermi gas with 1D spin-orbit coupling (SOC) at zero temperature and find that the system undergoes a transition from the paramagnetic phase to the ferromagnetic phase under suitable dipolar interaction constant $\lambda_{\rm d}$, SOC constant $\lambda_{\rm SOC}$ and contact interaction constant $\lambda_{\rm s}$. This phase transition can be of either 1st order or 2nd order, depending on the parameters. Near the 2nd-order phase transition, the system is partially magnetized in the ferromagnetic phase. With SOC, the ferromagnetic phase can even exist in the absence of the contact interaction. The increase in dipolar interaction, SOC strength, and contact interaction are all helpful to stabilize the ferromagnetic state. The critical dipolar interaction strength at the phase transition can be reduced by the increase in SOC strength or contact interaction. Phase diagrams of these systems are obtained.
收稿日期: 2019-09-29
出版日期: 2020-01-18
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2020, Vol. 37 
