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arXiv 1806.02478cond-mat.quant-gas
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光晶格中自旋轨道耦合费米子的Bloch束缚态

Bloch bound state of spin-orbit-coupled fermions in an optical lattice

Baihua Gong, Shuai Li, Xin-Hui Zhang, Bo Liu, Wei Yi

摘要:

了解少体物理学的基本原理为阐明多体性质提供了一个有趣的自下而上的方法。在光学喇曼晶格中实现自旋轨道耦合(SOC)的实验进展为发现由SOC与光晶格相互作用引起的新型少体特征提供了新的动力。利用Wilson重整化方法考虑高带效应,研究了自旋轨道耦合光晶格中自旋- $1/2$费米子的低能两体散射过程.我们证明,在弱SOC下,增加一个小的晶格势会破坏浅两体束缚态的稳定性,这与传统观点相反。另一方面,当晶格足够深时,二体束缚态总是通过增加晶格深度而稳定。束缚态稳定性的这种有趣的非单调行为源于SOC和光晶格之间的竞争,并可以通过分析低能量密度来解释。我们还讨论了高带效应对这种行为的影响,以及潜在的实验检测。

英文摘要:

Understanding fundamentals of few-body physics provides an interesting bottom-up approach for the clarification of many-body properties. The remarkable experimental progress in realizing spin-orbit coupling (SOC) in optical Raman lattices offers a renewed thrust towards discovering novel few-body features induced by the interplay between SOC and optical lattices. Using the Wilson renormalization method to account for high-band effects, we study the low-energy two-body scattering processes of spin-$1/2$ fermions in spin-orbit coupled optical lattices. We demonstrate that, under weak SOC, adding a small lattice potential would destabilize shallow two-body bound states, contrary to conventional wisdom. On the other hand, when lattice is sufficiently deep, two-body bound states are always stabilized by increasing the lattice depth. This intriguing non-monotonic behavior of the bound-state stability derives from the competition between SOC and optical lattices, and can be explained by analyzing the low-energy density of states. We also discuss the impact of high-band effects on such a behavior, as well as potential experimental detections.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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