# Bias induced circular spin current: Effects of environmental dephasing and disorder

## TL;DR

This paper develops a theory for bias-induced circular spin currents in quantum systems, highlighting how environmental dephasing and disorder can enhance these currents, with implications for spintronic device design.

## Contribution

It introduces a novel theoretical framework for analyzing circular spin currents in disordered and dephasing environments within quantum loops.

## Key findings

- Circular spin currents can be significantly enhanced by disorder and dephasing.
- The theory provides new insights into spin-dependent phenomena in quantum systems.
- Potential applications in designing advanced spintronic devices.

## Abstract

Analogous to circular spin current in an isolated quantum loop, bias induced spin circular current can also be generated under certain physical conditions in a nanojunction having single and/or multiple loop geometries which we propose first time, to the best of our concern, considering a magnetic quantum system. The key aspect of our work is the development of a suitable theory for defining and analyzing circular spin current in presence of environmental dephasing and impurities. Unlike transport current in a conducting junction, circular current may enhance significantly in presence of disorder and phase randomizing processes. Our analysis provides a new spin dependent phenomenon, and can give important signatures in designing suitable spintronic devices as well as selective spin regulations.