Electrically tuneable nonlinear anomalous Hall effect in two-dimensional 
transition-metal dichalcogenides WTe2 and MoTe2

Zhang, Yang; van den Brink, Jeroen; Felser, Claudia; Yan, Binghai

doi:10.1088/2053-1583/aad1ae

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Electrically tuneable nonlinear anomalous Hall effect in two-dimensional transition-metal dichalcogenides WTe₂ and MoTe₂

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Zhang, Yang
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Zhang, Y., van den Brink, J., Felser, C., & Yan, B. (2018). Electrically tuneable nonlinear anomalous Hall effect in two-dimensional transition-metal dichalcogenides WTe₂ and MoTe₂. 2D Materials, 5(4): 044001, pp. 1-6. doi:10.1088/2053-1583/aad1ae.

Cite as: https://hdl.handle.net/21.11116/0000-0001-E1EA-9

Abstract

We studied the nonlinear electric response in WTe2 and MoTe2 monolayers. When the inversion symmetry is breaking but the the time-reversal symmetry is preserved, a second-order Hall effect called the nonlinear anomalous Hall effect (NLAHE) emerges owing to the nonzero Berry curvature on the nonequilibrium Fermi surface. We reveal a strong NLAHE with a Hall-voltage that is quadratic with respect to the longitudinal current. The optimal current direction is normal to the mirror plane in these two-dimensional (2D) materials. The NLAHE can be sensitively tuned by an out-of-plane electric field, which induces a transition from a topological insulator to a normal insulator. Crossing the critical transition point, the magnitude of the NLAHE increases, and its sign is reversed. Our work paves the way to discover exotic nonlinear phenomena in inversion-symmetry-breaking 2D materials.