论文标题
强烈相互作用的费米气体之间的介观旋转
Mesoscopic spin transport between strongly interacting Fermi gases
论文作者
论文摘要
我们研究了通过量子点接触强烈相互作用的费米气体的介质自旋电流。在左右储层中的自旋极化在大小但相反的情况下，我们通过线性响应理论和多体$ t $ -matrix近似来计算准粒子对电流的贡献。对于一个小的自旋偏置状态，由于伪造的形成，超流体过渡温度附近的电流被强烈抑制。另一方面，对于气体高度极化的大型自旋偏置状态，电流会受到费米极性引起的少数状态密度的影响。我们还讨论了与有吸引力的极性峰值相关的准颗粒峰的扩大，这与增强相关。
We investigate a mesoscopic spin current for strongly interacting Fermi gases through a quantum point contact. Under the situation where spin polarizations in left and right reservoirs are same in magnitude but opposite in sign, we calculate the contribution of quasiparticles to the current by means of the linear response theory and many-body $T$-matrix approximation. For a small spin-bias regime, the current in the vicinity of the superfluid transition temperature is strongly suppressed due to the formation of pseudogaps. For a large spin-bias regime where the gases become highly polarized, on the other hand, the current is affected by the enhancement of a minority density of states due to Fermi polarons. We also discuss the broadening of a quasiparticle peak associated with an attractive polaron at a large momentum, which is relevant to the enhancement.
