# Chern insulator in a ferromagnetic two-dimensional electron system with Dresselhaus spin-orbit coupling

## TL;DR

This paper proposes a practical method to realize a Chern insulator in a 2D electron system with Dresselhaus spin-orbit coupling by tuning magnetization orientation, supported by analytical and computational evidence, with potential applications in topological spintronics.

## Contribution

It introduces a new approach to induce topological phases in 2D electron systems via magnetization orientation tuning, avoiding the need for tunable exchange coupling after fabrication.

## Key findings

- Topological phase transitions occur with magnetization orientation changes.
- Chern number varies between 1, 0, -1 depending on magnetization.
- Analytical results are confirmed by band structure and transport calculations.

## Abstract

We propose a Chern insulator in a two-dimensional electron system with Dresselhaus spin-orbit coupling, ferromagnetism, and spin-dependent effective mass. The analytically-obtained topological phase diagrams show the topological phase transitions induced by tuning the magnetization orientation with the Chern number varying between $1,0,-1$. The magnetization orientation tuning shown here is a more practical way of triggering the topological phase transitions than manipulating the exchange coupling that is no longer tunable after the fabrication of the system. The analytic results are confirmed by the band structure and transport calculations, showing the feasibility of this theoretical proposal. With the advanced and mature semiconductor engineering today, this Chern insulator is very possible to be experimentally realized and also promising to topological spintronics.