# Engineering magnetoresistance: A new perspective

## TL;DR

This paper proposes a novel magnetic quantum device design using a quasiperiodic Aubry-André layer as a spacer to achieve high magnetoresistance, controllable via external phase tuning, and explores the effects of dephasing on transport.

## Contribution

It introduces a new approach to enhance magnetoresistance using quasiperiodic layers and analyzes the impact of dephasing, with potential experimental implementations.

## Key findings

- High MR achievable with Aubry-André spacer
- MR can be controlled by tuning AAH phase
- Dephasing affects magnetotransport properties

## Abstract

A new proposal is given to achieve high degree of magnetoresistance (MR) in a magnetic quantum device where two magnetic layers are separated by a non-magnetic (NM) quasiperiodic layer that acts as a spacer. The NM spacer is chosen in the form of well-known Aubry-Andr\'{e} or Harper (AAH) model which essentially gives the non-trivial features in MR due to its gaped spectrum and yields the opportunities of controlling MR selectively by tuning the AAH phase externally. We also explore the role of dephasing on magnetotransport to make the model more realistic. Finally, we illustrate the experimental possibilities of our proposed quantum system.