Particle and spin transports of spin-orbit coupled Fermi gas through a Quantum Point Contact

TL;DR

This study explores how spin-orbit coupling influences particle and spin transport in a Fermi gas through a quantum point contact, revealing conductance plateaus, enhanced particle conductance, and controllable current conversion.

Contribution

It demonstrates the effects of Raman-induced spin-orbit coupling on transport properties and current conversion in Fermi gases, highlighting control via two-photon detuning.

Findings

Particle and spin conductances show plateau structures.

Spin-orbit coupling enhances particle conductance.

Particle and spin current conversion is controllable by two-photon detuning.

Abstract

The particle and spin transport through a quantum point contact between two Fermi gases with Raman-induced spin-orbit coupling are investigated. We show that the particle and spin conductances both demonstrate the structure of plateau due to the mesoscopic scale of the quantum point contact. Compared with the normal Fermi gases the particle conductance can be significantly enhanced by the spin-orbit coupling effect. Furthermore, the conversion of the particle and spin currents can take place in the spin-orbit coupled system, and we find that it is controlled by the parameter of two-photon detuning. When the parameter of two-photon detuning vanishes the particle and spin currents decouple.