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A Wide‐Range Photosensitive Weyl Semimetal Single Crystal—TaAs
Author(s) -
Chi Shumeng,
Li Zhilin,
Xie Ying,
Zhao Yongguang,
Wang Zeyan,
Li Lei,
Yu Haohai,
Wang Gang,
Weng Hongming,
Zhang Huaijin,
Wang Jiyang
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201801372
Subject(s) - weyl semimetal , semimetal , photocurrent , photodetector , materials science , fermi level , condensed matter physics , optoelectronics , physics , band gap , quantum mechanics , electron
Mid‐ and even long‐infrared photodetection is highly desired for various modern optoelectronic devices, and photodetectors that operate at room temperature (RT) remain challenging and are being extensively sought. Recently, the Weyl semimetal has attracted much interest, and its Lorentz invariance can be broken to have tilted chiral Weyl cones around the Fermi level, which indicates that the photocurrent can be generated by the incident photons at arbitrarily long wavelengths. Furthermore, the atypical linear dispersion bands in Weyl cones result in high carrier mobility and quadratic energy dependence of the density of states, which can enhance the efficiency of the photocurrent and suppress thermal carriers, in addition to its favorable large absorption coefficient. In this study, a Weyl semimetal TaAs photodetecting prototype is reported, which operates at RT with an outstanding response that ranges from the visible to the long‐infrared range. This study indicates that the Weyl semimetal TaAs should boost the development of modern optoelectronics and photonics.