Effect of cosmic string on spin dynamics

TL;DR

This paper explores how cosmic strings influence spin dynamics, including spin currents and Hall electric fields, by modifying electromagnetic interactions and inducing oscillating spin electric fields in various materials.

Contribution

It introduces a novel analysis of cosmic string effects on spin transport phenomena, deriving explicit formulas for spin electric fields and currents affected by cosmic string parameters.

Findings

Cosmic strings modify the spin orbit coupling and gauge fields.

The spin electric field and current become oscillatory and defect-dependent.

Hall electric fields are influenced by cosmic string parameters in crystal models.

Abstract

In the present paper, we have investigated the role of cosmic string on spin current and Hall electric field. Due to the background cosmic string, the modified electric field of the system generates renormalized spin orbit coupling, which induces a modified non-Abelian gauge field. The defect causes a change in the AB and AC phases appearing due to the modified electromagnetic field. In addition, for a time varying electric field we perform explicit analytic calculations to derive the exact form of spin electric field and spin current, which is defect parameter dependent and of oscillating type. Furthermore, in an asymmetric crystal within the Drude model approach we investigate the dependence of the cosmic string parameters on cosmic string induced Hall electric field.