Deformations of the spin currents by topological screw dislocation and cosmic dispiration

TL;DR

This paper investigates how topological screw dislocation and cosmic dispiration geometries influence spin currents, revealing that these defects modify spin polarization and currents differently, with implications for spin-Hall conductivity.

Contribution

It introduces a geometric framework to analyze the effects of topological defects on spin currents using the extended Drude model, highlighting distinct impacts of screw dislocation and cosmic dispiration.

Findings

Screw dislocation bends the spin current direction without changing magnitude.

Cosmic dispiration affects both the direction and magnitude of spin currents.

Spin-Hall conductivity remains unaffected by screw dislocation.

Abstract

We study the spin currents induced by topological screw dislocation and cosmic dispiration. By using the extended Drude model, we find that the spin dependent forces are modified by the nontrivial geometry. For the topological screw dislocation, only the direction of spin current is bended by deforming the spin polarization vector. In contrast, the force induced by cosmic dispiration could affect both the direction and magnitude of the spin current. As a consequence, the spin-Hall conductivity doesn't receive corrections from screw dislocation.