Anisotropic Picosecond Spin-Photocurrent from Weyl Semimetal WTe2
- Mengji ChenMengji ChenDepartment of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576, SingaporeMore by Mengji Chen
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- Kyusup LeeKyusup LeeDepartment of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576, SingaporeMore by Kyusup Lee
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- Jie LiJie LiCenter for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaMore by Jie Li
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- Liang ChengLiang ChengDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, SingaporeMore by Liang Cheng
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- Qisheng WangQisheng WangDepartment of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576, SingaporeMore by Qisheng Wang
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- Kaiming CaiKaiming CaiDepartment of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576, SingaporeMore by Kaiming Cai
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- Elbert E. M. ChiaElbert E. M. ChiaDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, SingaporeMore by Elbert E. M. Chia
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- Haixin ChangHaixin ChangCenter for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaMore by Haixin Chang
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- Hyunsoo Yang*Hyunsoo Yang*Email: [email protected]. Phone: (+65) 65167217.Department of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576, SingaporeMore by Hyunsoo Yang
Abstract
The generation and detection of ultrafast spin current, preferably reaching a frequency up to terahertz, is the core of spintronics. Studies have shown that the Weyl semimetal WTe2 is of great potential in generating spin currents. However, the prior studies have been limited to the static measurements with the in-plane spin orientation. In this work, we demonstrate a picosecond spin-photocurrent in a Td-WTe2 thin film via a terahertz time domain spectroscopy with a circularly polarized laser excitation. The anisotropic dependence of the circular photogalvanic effect (CPGE) in the terahertz emission reveals that the picosecond spin-photocurrent is generated along the rotational asymmetry a-axis. Notably, the generated spins are aligned along the out-of-plane direction under the light normally incident to the film surface, which provides an efficient means to manipulate magnetic devices with perpendicular magnetic anisotropy. A spin-splitting band induced by intrinsic inversion symmetry breaking enables the manipulation of a spin current by modulating the helicity of the laser excitation. Moreover, CPGE nearly vanishes at a transition temperature of ∼175 K due to the carrier compensation. Our work provides an insight into the dynamic behavior of the anisotropic spin-photocurrent of Td-WTe2 in terahertz frequencies and shows a great potential for the future development of terahertz-spintronic devices with Weyl semimetals.
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