期刊
2D MATERIALS
卷 9, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2053-1583/ac3e03
关键词
optoelectronics; Weyl semimetal; van der Waals materials; photocurrent; ultrafast; phase disorder
资金
- DFG [HO 3324/12-1, BU 1125/11-1]
- Deutsche Forschungsgemeinschaft (DFG) through the German Excellence Strategy via the Munich Center for Quantum Science and Technology (MCQST) [EXC-2111-390814868]
- TUM International Graduate School of Science and Engineering (IGSSE)
- MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [19H05790, JP20H00354]
This study investigates the impact of crystal phase disorder on the generation of helicity-dependent photocurrents in layered MoTe2. By using scanning photocurrent microscopy, the phase transition and hysteresis between different crystal phases are spatially probed. The results reveal a highly disordered photocurrent response in the intermediate temperature regime, and suggest that the helicity-dependent and ultrafast photocurrents are likely due to a local breaking of the electronic symmetries. These findings highlight the significance of local domain morphologies and ultrafast relaxation dynamics on the optoelectronic properties of low-dimensional van der Waals circuits.
We address the impact of crystal phase disorder on the generation of helicity-dependent photocurrents in layered MoTe2, which is one of the van der Waals materials to realize the topological type-II Weyl semimetal phase. Using scanning photocurrent microscopy, we spatially probe the phase transition and its hysteresis between the centrosymmetric, monoclinic 1T' phase to the symmetry-broken, orthorhombic Td phase as a function of temperature. We find a highly disordered photocurrent response in the intermediate temperature regime. Moreover, we demonstrate that helicity-dependent and ultrafast photocurrents in MoTe2 arise most likely from a local breaking of the electronic symmetries. Our results highlight the prospects of local domain morphologies and ultrafast relaxation dynamics on the optoelectronic properties of low-dimensional van der Waals circuits.
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