期刊
2D MATERIALS
卷 7, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/ab8d82
关键词
Dirac semimetal; 2D layered materials; photocurrent response
资金
- Beijing Nature Science Foundation [JQ19001]
- National Natural Science Foundation of China [11674013, 91750109]
- State Key Laboratory of Precision Measurement Technology and Instruments Fund for open topics
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 mu m. A moderate responsivity of 34 mu 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 PtTe2. The measurement results show clear anisotropic photocurrent response through polarization-dependent measurement and a response time of 34 mu s can be extracted from chopping frequency-dependent measurement. We provide a comprehensive study of the photocurrent response of type-II Dirac semi-metallic PtTe2.
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