Polaron and molecular states of a spin-orbit coupled impurity in a spinless Fermi sea
Polaron and molecular states of a spin-orbit coupled impurity in a spinless Fermi sea
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无自旋费米海中自旋轨道耦合杂质的极化子和分子态
DOI：
10.1088/1674-1056/ac1b85
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Sun Qing
中科院分区：
文献类型：
--
作者：
Yin Honghao;Xie Tianyang;Ji Anchun;Sun Qing
研究了一维自旋轨道耦合（SOC）的费米子原子与三维无自旋费米海耦合时的极化子和分子态。由于自旋轨道耦合、拉曼耦合和原子间自旋选择相互作用的共同作用，自旋轨道耦合杂质诱导的极化子态具有独特的性质。我们发现极化子的能量色散一般具有双极小结构，这导致了有限的质心（c.m.）在基态的动量，不同于零动量极化子，SOC被引入到大多数原子。通过进一步调整原子间相互作用强度等参数，可以得到不同c.m.可能出现动量，由准粒子残留物的奇异行为和极化子的有效质量来表示。同时，激光在杂质原子上产生自组织光场，引入拉曼耦合和有效塞曼场，对分子态以及极化子到分子的跃迁也有很强的影响.我们还讨论了更一般的自旋相关的相互作用和质量比的影响。这些结果将有助于SOC带来的杂质物理的研究。
We investigate the polaron and molecular states of a fermionic atom with one-dimensional spin-orbit coupling (SOC) coupled to a three-dimensional spinless Fermi sea. Because of the interplay among the SOC, Raman coupling and spinselected interatomic interactions, the polaron state induced by the spin-orbit coupled impurity exhibits quite unique features. We find that the energy dispersion of the polaron generally has a double-minimum structure, which results in a finite center-of-mass (c.m.) momentum in the ground state, different from the zero-momentum polarons where SOC are introduced into the majority atoms. By further tuning the parameters such as the atomic interaction strength, a discontinuous transition between the polarons with different c.m. momenta may occur, signaled by the singular behavior of the quasiparticle residue and effective mass of the polaron. Meanwhile, the molecular state as well as the polaron-to-molecule transition is also strongly affected by the Raman coupling and the effective Zeeman field, which are introduced by the lasers generating SOC on the impurity atom. We also discuss the effects of a more general spin-dependent interaction and mass ratio. These results would be beneficial for the study of impurity physics brought by SOC.