Robust edge photocurrent response on layered type II Weyl semimetal WTe2

Qinsheng Wang, Jingchuan Zheng, Yuan He, Jin Cao, Xin Liu, Maoyuan Wang, Junchao Ma, Jiawei Lai, Hong Lu, Shuang Jia, Dayu Yan, Youguo Shi, Junxi Duan, Junfeng Han, Wende Xiao, Jian-Hao Chen, Kai Sun, Yugui Yao () and Dong Sun ()
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Qinsheng Wang: Beijing Institute of Technology
Jingchuan Zheng: Beijing Institute of Technology
Yuan He: Beijing Institute of Technology
Jin Cao: Beijing Institute of Technology
Xin Liu: Peking University
Maoyuan Wang: Beijing Institute of Technology
Junchao Ma: Peking University
Jiawei Lai: Peking University
Hong Lu: Peking University
Shuang Jia: Peking University
Dayu Yan: Institute of Physics, Chinese Academy of Sciences
Youguo Shi: Institute of Physics, Chinese Academy of Sciences
Junxi Duan: Beijing Institute of Technology
Junfeng Han: Beijing Institute of Technology
Wende Xiao: Beijing Institute of Technology
Jian-Hao Chen: Peking University
Kai Sun: University of Michigan
Yugui Yao: Beijing Institute of Technology
Dong Sun: Peking University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Photosensing and energy harvesting based on exotic properties of quantum materials and new operation principles have great potential to break the fundamental performance limit of conventional photodetectors and solar cells. Weyl semimetals have demonstrated novel optoelectronic properties that promise potential applications in photodetection and energy harvesting arising from their gapless linear dispersion and Berry field enhanced nonlinear optical effect at the vicinity of Weyl nodes. In this work, we demonstrate robust photocurrent generation at the edge of Td-WTe2, a type-II Weyl semimetal, due to crystalline-symmetry breaking along certain crystal fracture directions and possibly enhanced by robust fermi-arc type surface states. This edge response is highly generic and arises universally in a wide class of quantum materials with similar crystal symmetries. The robust and generic edge current response provides a charge separation mechanism for photosensing and energy harvesting over broad wavelength range.

Date: 2019
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DOI: 10.1038/s41467-019-13713-1

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