Reversal of anomalous Hall conductivity by perpendicular electric field in 2D WSe2/VSe2 heterostructure

Abstract

Anomalous Hall conductivity (AHC) and valley polarization are attracting tremendous interest in spintronics and valleytronics technologies. Here, we investigate the possibility of the electric field induced switching of the AHC and magnetic proximity effect induced valley polarization in the two-dimensional (2D) WSe2/1T-VSe2 heterostructure. Due to the small total energy difference, two stackings could happen (C-I and C-II). The WSe2 layer has a valley polarization of -19 meV in the C-II stacking, and it is further increased up to -28 meV under electric fields. Also, we obtain an AHC of 75 (80) S/cm in the C-I (II) stacking. We find a sign change from positive AHC to negative value under the electric field in hole doping of the C-II stacking. We attribute this reversal of the AHC to the electric field dependent Berry curvature variation. Our finding suggests that the electric field induced AHC switching can be possible in the 2D heterostructure.