Photocurrent response of type-II Dirac semimetal PtTe <sub>2</sub>
Jiawei Lai, Junchao Ma, Yinan Liu, Kenan Zhang, Xiao Zhuo, Jianhao Chen, Shuyun Zhou, Dong Sun
Abstract
Abstract Recently, topological semimetals have attracted extensive research interest in optoelectronics properties, especially in the area of high-performance photodetection for low-energy photons. Among various topological semimetals, the photocurrent response of type-II Dirac semimetals with tilted cones that breaks Lorentz invariance is seldom studied. In this work, we report the photocurrent response studies of a lateral field-effect device based on type-II Dirac semimetal PtTe 2 over a broad wavelength range from 532 nm4 μ m. A moderate responsivity of 34 μ A W −1 is obtained at 633 nm without applying any external bias. Further excitation power and temperature-dependent measurements are performed to reveal the photocurrent response mechanism of PtTe 2 . The measurement results show clear anisotropic photocurrent response through polarization-dependent measurement and a response time of 34 μ s can be extracted from chopping frequency-dependent measurement. We provide a comprehensive study of the photocurrent response of type-II Dirac semi-metallic PtTe 2 .