标题：A Wide-Range Photosensitive Weyl Semimetal Single Crystal-TaAs
作者：Chi, Shumeng; Li, Zhilin; Xie, Ying; Zhao, Yongguang; Wang, Zeyan; Li, Lei; Yu, Haohai; Wang, Gang; Weng, Hongming; Zhang, Huaijin; 更多 作者机构：[Chi, Shumeng; Xie, Ying; Wang, Zeyan; Yu, Haohai; Zhang, Huaijin; Wang, Jiyang] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peo 更多
通讯作者：Yu, HH;Zhang, HJ;Yu, HH;Zhang, HJ;Wang, G;Weng, HM;Weng, HM;Yu, Haohai
通讯作者地址：[Yu, HH; Zhang, HJ]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China;[Yu, HH; Zhang, HJ]Shandong Univ, Inst Crystal Ma 更多
关键词：mid- and long-infrared; photodetection; TaAs; Weyl semimetals
摘要：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 opto-electronics and photonics.