Reentrant superfluidity and pair density wave in single-component dipolar Fermi gases
Reentrant superfluidity and pair density wave in single-component dipolar Fermi gases
复制标题
单组分偶极费米气体中的折返超流性和电子对密度波
DOI：
10.1103/physreva.93.063611
复制
发表时间：
2016-06-10
影响因子：
2.9
通讯作者：
Chen, Qijin
中科院分区：
文献类型：
--
作者：
Che, Yanming;Wang, Jibiao;Chen, Qijin
本文用对涨落理论研究了三维单组分偶极费米气体的超流性。转变温度Tc随偶极-偶极相互作用（DDI）诱导的对强度的变化而表现出明显的重入行为，从而导致各向异性的对色散。DDI的各向异性和长程性质导致T_c在中等相互作用强度的窄范围内消失，此时出现一个对密度波态作为基态。本文还研究了在T_{c}以下的超流密度和热力学性质，以及在谐振阱中的密度分布，并对BCS-BEC过渡区进行了沿着研究。实验的影响进行了讨论。
We study the superfluidity of single component dipolar Fermi gases in three dimensions within a pairing fluctuation theory. The transition temperature $T_{c}$ for the dominant $p_z$ wave superfluidity exhibits a remarkable re-entrant behavior as a function of the pairing strength induced by the dipole-dipole interaction (DDI), which leads to an anisotropic pair dispersion. The anisotropy and the long range nature of the DDI cause $T_c$ to vanish for a narrow range of intermediate interaction strengths, where a pair density wave state emerges as the ground state. The superfluid density and thermodynamics below $T_{c}$, along with the density profiles in a harmonic trap, are investigated as well, throughout the BCS-BEC crossover. Implications for experiments are discussed.