Spin Current of Fermions Induced in Spin-Orbit Coupled Bose-Fermi Mixture

摘要

The novel controllability of a spin current in cold atoms is studied. We show that a mixture of spin-1/2 fermions and spin-orbit (SO) coupled pseudospin-1/2 bosons at zero temperature can form a fermionic spin current, which is experimentally controllable with an external laser applied to the bosons to create the SO coupling. We derive the ground-state phase diagram of the bosons using a variational wave function and identify the magnetic structure of each phase. The spin current of the fermions with the background of the spiral/precessed magnetization of the bosons is calculated as a function of the wave vector and intensity of the external laser. We show that the spin current increases and then decreases, forming a peak, as the wave vector of the laser increases, which indicates the controllability of the spin current with the laser parameters.