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Title: A room-temperature gate-tunable bipolar valley Hall effect in molybdenum disulfide/tungsten diselenide heterostructures
Authors: Jiang, Chongyun
Rasmita, Abdullah
Ma, Hui
Tan, Qinghai
Zhang, Zhaowei
Huang, Zumeng
Lai, Shen
Wang, Naizhou
Liu, Sheng
Liu, Xue
Yu, Ting
Xiong, Qihua
Gao, Weibo
Keywords: Science::Physics
Issue Date: 2022
Source: Jiang, C., Rasmita, A., Ma, H., Tan, Q., Zhang, Z., Huang, Z., Lai, S., Wang, N., Liu, S., Liu, X., Yu, T., Xiong, Q. & Gao, W. (2022). A room-temperature gate-tunable bipolar valley Hall effect in molybdenum disulfide/tungsten diselenide heterostructures. Nature Electronics, 5(1), 23-27.
Project: NRF-CRP21-2018-0007
MOE2016-T3-1-006 (S)
Journal: Nature Electronics
Abstract: Two-dimensional semiconductors have a valley degree of freedom that could be used as a platform for future optoelectronic devices. The valley Hall effect, caused by electrons in different valleys having opposite Berry curvatures, is important for making such devices, but has only been reported with plasmonic structures or at cryogenic temperatures, limiting practical application. Here we report the observation of the valley Hall effect at room temperature in a molybdenum disulfide/tungsten diselenide van der Waals heterostructure. We show that the magnitude and polarity of the valley Hall effect in the heterostructure are gate tunable, which can be attributed to the contribution of the opposite valley Hall effect from electrons and holes in different layers. We use this gate tunability to create a bipolar valleytronic transistor.
ISSN: 2520-1131
DOI: 10.1038/s41928-021-00686-7
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
The Photonics Institute 
Rights: © 2021 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. This paper was published in Nature Electronics and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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