Two-component dimers of ultracold atoms with center-of-mass-momentum dependent interactions  

作　　者：Yaru Liu Shu Yang Peng Zhang 

机构地区：[1]Department of Physics,Renmin University of China,Beijing 100872,China [2]Graduate School of China Academy of Engineering Physics,Beijing 100193,China [3]Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education),Renmin University of China,Beijing 100872,China

出　　处：《Communications in Theoretical Physics》2024年第4期153-157,共5页理论物理通讯（英文版）

基　　金：supported by the National Key Research and Development Program of China (Grant No. 2022YFA1405300);the National Safety Academic Fund (Grant No. U1930201);the Fundamental Research Funds for the Central Universities;the Research Funds of Renmin University of China (22XNH100)

摘　　要：In a previous paper[Phys.Rev.A95,060701(R)(2017)],we demonstrated that a new type of two-body interaction,which depends on the center of mass(CoM)momentum,can be realized for ultracold atoms via laser-modulated magnetic Feshbach resonance(MFR).Further studies(e.g.L He et al,Phys.Rev.Lett.120,045302(2018))show that various interesting phenomena,such as Fulde–Ferrell superfluids,can be induced by scattering between ultracold atoms with this interaction.In this work we investigate the shallow bound states of two ultracold atoms with this type of interaction.We show that when the magnetic field B is below the MFR point B0,two shallow bound states can appear in this system.Namely,a'two-component dimer'or a dimer with pseudo-spin 1/2 can be formed by two atoms.Furthermore,the dispersion curve of the dimer may have either single or double minimums in the CoM momentum space.The latter case can be explained as a result from significant pseudo-spin-orbital coupling(SOC)effects.Our results show that the ultracold gases with CoM momentum dependent interaction may be a candidate for quantum simulations with ultracold two-component molecules,especially the molecule gases with SOC.

关 键 词：center-of-mass-momentum dependent interaction Raman-laser modulated MFR two-component dimer 

分 类 号：O562[理学—原子与分子物理]