Spin-orbit coupled Fermi gases across a Feshbach resonance.
Spin-orbit coupled Fermi gases across a Feshbach resonance.
复制标题
DOI：
10.1103/physrevlett.107.195305
复制
发表时间：
2011-05
影响因子：
8.6
通讯作者：
Zeng-Qiang Yu;H. Zhai
中科院分区：
文献类型：
--
作者：
Zeng-Qiang Yu;H. Zhai
在这封信中，我们利用平均场理论和两体问题的精确解，研究了自旋1/2费米气体通过具有合成自旋-轨道耦合的Feshbach共振的基态性质和超流转变温度。结果表明，由于费米面上态密度的增加，强的自旋-轨道耦合可以显著提高负散射长度a(S)的配对能隙。当a(S)≤为0时，强的自旋-轨道耦合也能显著地将超流转变温度T_c提高到相当大的费米温度，而当a(S)为正时，它对T_c略有抑制。还讨论了共振时的相互作用能和对的大小。
In this Letter we study both ground state properties and the superfluid transition temperature of a spin-1/2 Fermi gas across a Feshbach resonance with a synthetic spin-orbit coupling, using the mean-field theory and the exact solution of two-body problem. We show that a strong spin-orbit coupling can significantly enhance the pairing gap for negative scattering length a(s), due to increased density of state at Fermi surface. Strong spin-orbit coupling can also significantly enhance the superfluid transition temperature Tc to a sizable fraction of Fermi temperature when a(s) ≤ 0, while it suppresses Tc slightly for positive a(s). The interaction energy and pair size at resonance are also discussed.