Intrinsic valley Hall transport in atomically thin MoS2

Zefei Wu (), Benjamin T. Zhou, Xiangbin Cai, Patrick Cheung, Gui-Bin Liu, Meizhen Huang, Jiangxiazi Lin, Tianyi Han, Liheng An, Yuanwei Wang, Shuigang Xu, Gen Long, Chun Cheng, Kam Tuen Law, Fan Zhang () and Ning Wang ()
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Zefei Wu: the Hong Kong University of Science and Technology
Benjamin T. Zhou: the Hong Kong University of Science and Technology
Xiangbin Cai: the Hong Kong University of Science and Technology
Patrick Cheung: University of Texas at Dallas
Gui-Bin Liu: Beijing Institute of Technology
Meizhen Huang: the Hong Kong University of Science and Technology
Jiangxiazi Lin: the Hong Kong University of Science and Technology
Tianyi Han: the Hong Kong University of Science and Technology
Liheng An: the Hong Kong University of Science and Technology
Yuanwei Wang: the Hong Kong University of Science and Technology
Shuigang Xu: the Hong Kong University of Science and Technology
Gen Long: the Hong Kong University of Science and Technology
Chun Cheng: Southern University of Science and Technology
Kam Tuen Law: the Hong Kong University of Science and Technology
Fan Zhang: University of Texas at Dallas
Ning Wang: the Hong Kong University of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Electrons hopping in two-dimensional honeycomb lattices possess a valley degree of freedom in addition to charge and spin. In the absence of inversion symmetry, these systems were predicted to exhibit opposite Hall effects for electrons from different valleys. Such valley Hall effects have been achieved only by extrinsic means, such as substrate coupling, dual gating, and light illuminating. Here we report the first observation of intrinsic valley Hall transport without any extrinsic symmetry breaking in the non-centrosymmetric monolayer and trilayer MoS2, evidenced by considerable nonlocal resistance that scales cubically with local resistance. Such a hallmark survives even at room temperature with a valley diffusion length at micron scale. By contrast, no valley Hall signal is observed in the centrosymmetric bilayer MoS2. Our work elucidates the topological origin of valley Hall effects and marks a significant step towards the purely electrical control of valley degree of freedom in topological valleytronics.

Date: 2019
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DOI: 10.1038/s41467-019-08629-9

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