从自旋-轨道耦合费米海中出现的通用三聚体
Universal trimers emerging from a spin-orbit coupled Fermi sea
摘要：
本文报道了杂质与二维自旋轨道耦合费米气体相互作用诱导的普适三聚体态的存在。在费米海消失的零密度极限中，三聚体通过自旋轨道耦合下单粒子谱的对称性而稳定，因此相对于相互作用势的短程细节是{ \it普适的}。当费米能增加时，我们表明，三聚体是进一步稳定的粒子-空穴波动在一个相当大的参数区域。我们绘制了由三聚体，二聚体和极化子组成的相图，并讨论了使用射频光谱检测这些状态。在我们的工作中揭示的通用三聚体是一个有趣的三体相关性出现在一个多体环境，这在我们的情况下，是由单粒子光谱对称性和集体粒子-空穴激发合作支持的直接表现。
英文摘要：
We report the existence of a universal trimer state induced by an impurity interacting with a two-component spin-orbit coupled Fermi gas in two dimensions. In the zero-density limit with a vanishing Fermi sea, the trimer is stabilized by the symmetry of the single-particle spectrum under spin-orbit coupling, and is therefore {\it universal} against the short-range details of the interaction potential. When the Fermi energy increases, we show that the trimer is further stabilized by particle-hole fluctuations over a considerable parameter region. We map out the phase diagram consisting of trimers, dimers, and polarons, and discuss the detection of these states using radio-frequency spectroscopy. The universal trimer revealed in our work is a direct manifestation of intriguing three-body correlations emerging from a many-body environment, which, in our case, is cooperatively supported by the single-particle spectral symmetry and the collective particle-hole excitations.
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