论文标题
在非铁质自旋轨道偶联下的费米气体中的杂质
Impurity in a Fermi gas under non-Hermitian spin-orbit coupling
论文作者
论文摘要
我们研究了由耗散性拉曼激光器产生的非遗传旋转旋转轨道偶联（SOC），在两种组分的，非相互作用的费米气体中的杂质的命运。虽然SOC在费米气体中混合了两个自旋物种会改变单粒子分散体，但我们考虑了杂质仅与一种自旋物种相互作用的情况。结果，杂质的光谱特性构成了背景中耗散费米气体的理想探针。特别是，我们表明，耗散使极化子不稳定，而不是分子形成，这与先前的几个体型研究一致。费米气体的耗散性质进一步导致吸引力和排斥极化子分支的反射频频谱中的峰值扩大，这可以用作实验观察的信号。我们的结果提供了一个模范场景，可以探测非热性和相互作用的相互作用。
We study the fate of an impurity in a two-component, non-interacting Fermi gas under a non- Hermitian spin-orbit coupling (SOC) which is generated by dissipative Raman lasers. While SOC mixes the two spin species in the Fermi gas thus modifies the single-particle dispersions, we consider the case where the impurity only interacts with one of the spin species. As a result, spectral properties of the impurity constitute an ideal probe to the dissipative Fermi gas in the background. In particular, we show that dissipation destabilizes polarons in favor of molecular formation, consistent with previous few-body studies. The dissipative nature of the Fermi gas further leads to broadened peaks in the inverse radio-frequency spectra for both the attractive and repulsive polaron branches, which could serve as signals for experimental observation. Our results provides an exemplary scenario where the interplay of non-Hermiticity and interaction can be probed.
