Valley Berry curvature dipole induced nonlinear valley Hall effect

Abstract

Valley Hall effect is a signature effect in the field of valleytronics, and recent studies have pushed this effect into the nonlinear regime. Here, we reveal a previously unexplored type of nonlinear valley Hall effect which arises from a valley Berry curvature dipole (vBCD) mechanism. We show this nonlinear valley Hall effect is forbidden for conventional time-reversal-connected valleys, but is supported in the class of valleytronic systems featuring time-reversal-invariant valleys. The candidate layer groups and detailed symmetry constraints on vBCD are obtained. It shows the nonlinear valley Hall response, as well as the nonlinear charge Hall response, can be well controlled by tuning the driving field direction. We demonstrate our proposal in an effective model study and in a concrete material example, strained Nb₃SBr₇, by first-principles calculations. The nonlocal transport signature of this vBCD induced nonlinear valley Hall effect is also discussed.

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BibTeX RIS

BibTeX

@misc{xiong2026valley,
  title = {{Valley Berry curvature dipole induced nonlinear valley Hall effect}},
  author = {Lulu Xiong and Xue-Jin Zhang and Zeying Zhang and Yinning Zhou and Jin Cao and Cong Xiao and Shengyuan A. Yang},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.29226},
  eprint = {2609.29226},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.29226},
}

RIS

TY  - UNPB
TI  - Valley Berry curvature dipole induced nonlinear valley Hall effect
AU  - Lulu Xiong
AU  - Xue-Jin Zhang
AU  - Zeying Zhang
AU  - Yinning Zhou
AU  - Jin Cao
AU  - Cong Xiao
AU  - Shengyuan A. Yang
PY  - 2026
DA  - 2026/09/24
PB  - arXiv
DO  - 10.48550/arxiv.2609.29226
UR  - https://arxiv.org/abs/2609.29226
AB  - Valley Hall effect is a signature effect in the field of valleytronics, and recent studies have pushed this effect into the nonlinear regime. Here, we reveal a previously unexplored type of nonlinear valley Hall effect which arises from a valley Berry curvature dipole (vBCD) mechanism. We show this nonlinear valley Hall effect is forbidden for conventional time-reversal-connected valleys, but is supported in the class of valleytronic systems featuring time-reversal-invariant valleys. The candidate layer groups and detailed symmetry constraints on vBCD are obtained. It shows the nonlinear valley Hall response, as well as the nonlinear charge Hall response, can be well controlled by tuning the driving field direction. We demonstrate our proposal in an effective model study and in a concrete material example, strained Nb_3SBr_7, by first-principles calculations. The nonlocal transport signature of this vBCD induced nonlinear valley Hall effect is also discussed.
ER  -

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