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; Adam W Tsen

doi:10.1038/s41467-021-22343-5

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

Nat Commun. 2021 Apr 6;12(1):2049. doi: 10.1038/s41467-021-22343-5.

Authors

Archana Tiwari¹, Fangchu Chen¹, Shazhou Zhong¹, Elizabeth Drueke², Jahyun Koo³, Austin Kaczmarek², Cong Xiao⁴, Jingjing Gao⁵, Xuan Luo⁵, Qian Niu⁴, Yuping Sun^{5

6

7}, Binghai Yan³, Liuyan Zhao², Adam W Tsen⁸

Affiliations

¹ Institute for Quantum Computing, Department of Physics and Astronomy, and Department of Chemistry, University of Waterloo, Waterloo, ON, Canada.
² Department of Physics, University of Michigan, Ann Arbor, MI, USA.
³ Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel.
⁴ Department of Physics, The University of Texas at Austin, Austin, TX, USA.
⁵ Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, China.
⁶ Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China.
⁷ Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.
⁸ Institute for Quantum Computing, Department of Physics and Astronomy, and Department of Chemistry, University of Waterloo, Waterloo, ON, Canada. awtsen@uwaterloo.ca.

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 T_d 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.

Abstract

Grants and funding