Giant c-axis nonlinear anomalous Hall effect in Td-MoTe2 and WTe2

Archana Tiwari, Fangchu Chen, Shazhou Zhong, Elizabeth Drueke, Jahyun Koo, Austin Kaczmarek, Cong Xiao, Jingjing Gao, Xuan Luo, Qian Niu, Yuping Sun, Binghai Yan, Liuyan Zhao and Adam W. Tsen ()
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Archana Tiwari: University of Waterloo
Fangchu Chen: University of Waterloo
Shazhou Zhong: University of Waterloo
Elizabeth Drueke: University of Michigan
Jahyun Koo: Department of Condensed Matter Physics, Weizmann Institute of Science
Austin Kaczmarek: University of Michigan
Cong Xiao: The University of Texas at Austin
Jingjing Gao: Chinese Academy of Sciences
Xuan Luo: Chinese Academy of Sciences
Qian Niu: The University of Texas at Austin
Yuping Sun: Chinese Academy of Sciences
Binghai Yan: Department of Condensed Matter Physics, Weizmann Institute of Science
Liuyan Zhao: University of Michigan
Adam W. Tsen: University of Waterloo

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract While the anomalous Hall effect can manifest even without an external magnetic field, time reversal symmetry is nonetheless still broken by the internal magnetization of the sample. Recently, it has been shown that certain materials without an inversion center allow for a nonlinear type of anomalous Hall effect whilst retaining time reversal symmetry. The effect may arise from either Berry curvature or through various asymmetric scattering mechanisms. Here, we report the observation of an extremely large c-axis nonlinear anomalous Hall effect in the non-centrosymmetric Td phase of MoTe2 and WTe2 without intrinsic magnetic order. We find that the effect is dominated by skew-scattering at higher temperatures combined with another scattering process active at low temperatures. Application of higher bias yields an extremely large Hall ratio of E⊥/E|| = 2.47 and corresponding anomalous Hall conductivity of order 8 × 107 S/m.

Date: 2021
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DOI: 10.1038/s41467-021-22343-5

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