Strain Engineering of Photo-induced Topological Phases in 2D Ferromagnets

TL;DR

This paper demonstrates how strain and laser fields can induce and control topological phases in 2D ferromagnets, opening new avenues in topological spintronics.

Contribution

It introduces a method to engineer topological phases in 2D ferromagnets using strain and laser fields, enabling tunable topological transitions.

Findings

Strain and laser fields can induce topological phase transitions.

Synthetic Dzyaloshinskii-Moriya interactions are tunable by electric field and strain.

Transitions between phases with different Chern numbers are achievable.

Abstract

We argue that strain engineering is a powerful tool which may facilitate the experimental realization and control of topological phases in laser-driven 2D ferromagnetic systems. To this extent, we show that by applying a circularly polarized laser field to a 2D honeycomb ferromagnet which is uniaxially strained in either the zig-zag or armchair direction, it is possible to generate a synthetic Dzyaloshinskii-Moriya interaction (DMI) tunable by the intensity of the applied electric field, as well as by the magnitude of applied strain. Such deformations enable transitions to phases with opposite sign of Chern number, or to trivial phases. These are basic results that could pave the way for the development of a new field of Strain Engineered Topological Spintronics (SETS).