Quantum anomalous Hall effect of Dirac half-metal monolayer TiCl₃ with high Chern number

¹ School of Materials Science and Engineering, Hebei University of Technology - Tianjin 300401, China
² Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
³ School of Physics Sciences, University of Chinese Academy of Sciences - Beijing 100049, China
⁴ School of Science, Hebei University of Technology - Tianjin 300401, China

^(a) jiali@hebut.edu.cn (corresponding author)

Received: 23 June 2021
Accepted: 6 September 2021

Abstract

Based on first-principles calculations, monolayer TiCl₃ is predicted to be a 100% spin-polarized Dirac half-metal with ferromagnetic Curie temperature T_c of 63 K as predicted from Monte Carlo simulations. When considering the spin-orbit coupling, the Dirac point in the spin-up opens a ∼3 meV band gap. The calculated result of the anomalous Hall conductivity shows the Chern number , indicating that three corresponding gapless chiral edge states have emerged inside the bulk gap. Our findings suggest a feasible new member of the quantum anomalous Hall insulator family with promising applications in spintronic devices without dissipation edge states.