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.

中文翻译：

---

大范围光敏Weyl半金属单晶TaAs

各种现代光电设备都非常需要中红外和远红外光电检测，并且在室温（RT）下工作的光电检测器仍然具有挑战性，并且正在广泛寻求。最近，Weyl半金属引起了人们的极大兴趣，其Lorentz不变性可以被打破，以使费米能级周围的手性Weyl锥倾斜，这表明光电流可以由任意长波长的入射光子产生。此外，韦尔锥中的非典型线性色散带导致高的载流子迁移率和状态密度的二次能量依赖性，除了其有利的大吸收系数外，还可以提高光电流的效率并抑制热载流子。在这项研究中，报道了Weyl半金属TaAs光电探测原型，它在RT上运行时具有出色的响应，范围从可见光到长红外范围。这项研究表明，Weyl半金属TaAs应该促进现代光电和光子学的发展。