BCS-BEC crossover in three-dimensional Fermi gases with spherical spin-orbit coupling

Article

关键词: BOSE-EINSTEIN CONDENSATION;    NEUTRAL ATOMS;    QUARK MATTER;    SUPERCONDUCTIVITY;    DIMENSIONS;    EVOLUTION;    THERMODYNAMICS;    TEMPERATURE;    STATE;    FIELD;   

DOI  :  10.1103/PhysRevB.86.014511

来源: SCIE

【 摘 要 】

We present a systematic theoretical study of the BCS-BEC crossover problem in three-dimensional atomic Fermi gases at zero temperature with a spherical spin-orbit coupling which can be generated by a synthetic non-Abelian gauge field coupled to neutral fermions. Our investigations are based on the path-integral formalism, which is a powerful theoretical scheme for the study of the properties of the bound state, the superfluid ground state, and the collective excitations in the BCS-BEC crossover. At large spin-orbit coupling, the system enters the BEC state of a novel type of bound state (referred to as rashbon), which possesses a nontrivial effective mass. Analytical results and interesting universal behaviors for various physical quantities at large spin-orbit coupling are obtained. Our theoretical predictions can be tested in future experiments of cold Fermi gases with three-dimensional spherical spin-orbit coupling.

【 授权许可】

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