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Nonlinear anomalous Hall effect in few-layer WTe.

TitleNonlinear anomalous Hall effect in few-layer WTe.
Publication TypeJournal Article
Year of Publication2019
AuthorsKang, K, Li, T, Sohn, E, Shan, J, Mak, KFai
JournalNat Mater
Volume18
Issue4
Pagination324-328
Date Published2019 04
ISSN1476-1122
Abstract

The Hall effect occurs only in systems with broken time-reversal symmetry, such as materials under an external magnetic field in the ordinary Hall effect and magnetic materials in the anomalous Hall effect (AHE). Here we show a nonlinear AHE in a non-magnetic material under zero magnetic field, in which the Hall voltage depends quadratically on the longitudinal current. We observe the effect in few-layer T-WTe, a two-dimensional semimetal with broken inversion symmetry and only one mirror line in the crystal plane. Our angle-resolved electrical measurements reveal that the Hall voltage maximizes (vanishes) when the bias current is perpendicular (parallel) to the mirror line. The observed effect can be understood as an AHE induced by the bias current, which generates an out-of-plane magnetization. The temperature dependence of the Hall conductivity further suggests that both the intrinsic Berry curvature dipole and extrinsic spin-dependent scatterings contribute to the observed nonlinear AHE.

DOI10.1038/s41563-019-0294-7
Alternate JournalNat Mater
PubMed ID30804510