Electrically tuneable nonlinear anomalous Hall effect in two-dimensional transition-metal dichalcogenides WTe2 and MoTe2
Zhang Y, Van Den Brink J, Felser C, Yan B (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 5
Article Number: 044001
Journal Issue: 4
DOI: 10.1088/2053-1583/aad1ae
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.
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How to cite
APA:
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). https://doi.org/10.1088/2053-1583/aad1ae
MLA:
Zhang, Yang, et al. "Electrically tuneable nonlinear anomalous Hall effect in two-dimensional transition-metal dichalcogenides WTe2 and MoTe2." 2D Materials 5.4 (2018).
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