Controllable quantum spin precession by Aharonov-Casher phase in conducting ring

TL;DR

This paper presents an exact analysis of quantum spin transport in a conducting ring influenced by the Aharonov-Casher phase, demonstrating electric field control over spin-polarized currents and their polarizability.

Contribution

It provides an exact solution for spin transport in a textured electric field, revealing how the Aharonov-Casher phase controls spin polarization and polarizability.

Findings

Spin-polarized current can be electrically controlled.

Polarizability depends on the geometric phase.

Electric field influences spin precession in the ring.

Abstract

We investigate quantum spin transport in a structure of conducting ring, embedded in textured electric field, with two leads, and obtain an exact solution for the problem. The spin precession induced by the Aharonov-Casher phase is studied. It is shown that the spin-polarized current and its polarizability can be controlled by the electric field. As a result the polarizability is a function of the geometric phase which originates from the spin-orbital interaction in the ring. 72.25.-b, 03.65.Vf