Bloch bound state of spin-orbit-coupled fermions in an optical lattice
| Autor: | Gong, Baihua, Li, Shuai, Zhang, Xin-Hui, Liu, Bo, Yi, Wei |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 99, 012703 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.99.012703 |
| Popis: | 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. Comment: 6 pages, 4 figures, including supplementary materials |
| Databáze: | arXiv |
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