Abstract
Tuning the topological and magnetic properties of materials by applying an electric field is widely used in spintronics. In this work, we find a topological phase transition from topologically trivial to nontrivial states at an external electric field of about 0.1 V/Å in a monolayer that is a topologically trivial ferromagnetic semiconductor. It is shown that when electric field increases from 0 to 0.15 V/Å, the magnetic anisotropy energy (MAE) increases from about 0.1 to 6.3 meV, and the Curie temperature increases from 13 to about 61 K. The increased MAE mainly comes from the enhanced spin-orbit coupling due to the applied electric field. The enhanced can be understood from the enhanced hybridization and decreased energy difference between orbitals of Te atoms and orbitals of Mn atoms. Moreover, we propose two Janus materials, and monolayers with different internal electric polarizations, which can realize the quantum anomalous Hall effect (QAHE) with Chern numbers and , respectively. Our study not only exposes the electric field induced exotic properties of the monolayer but also proposes materials to realize QAHE in ferromagnetic Janus semiconductors with electric polarization.
- Received 22 September 2020
- Revised 10 February 2021
- Accepted 16 February 2021
DOI:https://doi.org/10.1103/PhysRevB.103.104403
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