Circular Photogalvanic Effect in the Weyl Semimetal TaAs

doi:10.1088/0256-307X/34/11/117203

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Abstract：Weyl semimetal (WSM) is expected to be an ideal spintronic material owing to its spin currents carried by the bulk and surface states with spin-momentum locking. The generation of a sizable photocurrent is predicted in non-centrosymmetric WSM arising from the broken inversion symmetry and the linear energy dispersion that is unique to Weyl systems. In our recent measurements, the circular photogalvanic effect (CPGE) is discovered in the TaAs WSM. The CPGE voltage is proportional to the helicity of the incident light, reversing direction if the radiation helicity changes handedness, a periodical oscillation therefore appears following the alteration of light polarization. We herein attribute the CPGE to the asymmetric optical excitation of the Weyl cone, which could result in an asymmetric distribution of photoexcited carriers in momentum space according to an optical spin-related selection rule.

收稿日期: 2017-09-11 出版日期: 2017-10-25

:	72.40.+w	(Photoconduction and photovoltaic effects)
	71.20.-b	(Electron density of states and band structure of crystalline solids)
	72.25.Fe	(Optical creation of spin polarized carriers)

引用本文:

. [J]. 中国物理快报, 2017, 34(11): 117203-.
Kai Sun, Shuai-Shuai Sun, Lin-Lin Wei, Cong Guo, Huan-Fang Tian, Gen-Fu Chen, Huai-Xin Yang, Jian-Qi Li. Circular Photogalvanic Effect in the Weyl Semimetal TaAs. Chin. Phys. Lett., 2017, 34(11): 117203-.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/34/11/117203 或 https://cpl.iphy.ac.cn/CN/Y2017/V34/I11/117203

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