# Using torsion to manipulate spin currents

## TL;DR

This paper explores how torsion, modeled by screw dislocations, can influence quantum particles and spin currents, offering a new approach for designing spintronic devices.

## Contribution

It demonstrates that torsion induces a geometric potential and couples to wave function phase, enabling manipulation of spin currents in spinor systems.

## Key findings

- Torsion creates a geometric potential affecting quantum particles.
- Torsion couples to the phase of wave functions, influencing spin currents.
- Potential application in spintronic device design.

## Abstract

We address the problem of quantum particles moving on a manifold characterised by the presence of torsion along a preferential axis. In fact, such a torsion may be taylored by the presence of a single screw dislocation, whose Burgers vector measures the torsion amplitude. The problem, first treated in the relativistic limit describing fermions that couple minimally to torsion, is then analysed in the Pauli limit We show that torsion induces a geometric potential and also that it couples generically to the phase of the wave function, giving rise to the possibility of using torsion to manipulate spin currents in the case of spinor wave functions. These results emerge as an alternative strategy for using screw dislocations in the design of spintronic-based devices.