Efimov physics and universal trimers in spin-orbit-coupled ultracold atomic mixtures

Zhe-Yu Shi, Hui Zhai, Xiaoling Cui

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10 Citations (Scopus)


We study the two-body and three-body bound states in ultracold atomic mixtures with one of the atoms subjected to an isotropic spin-orbit (SO) coupling. We consider a system of two identical fermions interacting with one SO-coupled atom. It is found that there can exist two types of three-body bound states, Efimov trimers and universal trimers. The Efimov trimers are energetically less favored by the SO coupling, which will finally merge into the atom-dimer threshold as increasing the SO-coupling strength. Nevertheless, these trimers exhibit a discrete scaling law incorporating the SO-coupling effect. On the other hand, the universal trimers are more favored by the SO coupling. They can be induced at negative s-wave scattering lengths and with smaller mass ratios than those without SO coupling. These results are obtained by both the Born-Oppenheimer approximation and exact solutions from three-body equations.
Original languageEnglish
Article number023618
Pages (from-to)1-11
Number of pages11
JournalPhysical Review A
Issue number2
Publication statusPublished - 18 Feb 2015
Externally publishedYes

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