Circular Photogalvanic Effect in the Weyl Semimetal TaAs

Kai Sun; Shuai-Shuai Sun; Lin-Lin Wei; Cong Guo; Huan-Fang Tian; Gen-Fu Chen; Huai-Xin Yang; Jian-Qi Li

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Circular Photogalvanic Effect in the Weyl Semimetal TaAs

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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.

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《中国物理快报：英文版》 |2017年第11期|84-88|共5页
作者
Kai Sun; Shuai-Shuai Sun; Lin-Lin Wei; Cong Guo; Huan-Fang Tian; Gen-Fu Chen; Huai-Xin Yang; Jian-Qi Li;
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作者单位

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049;

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049;

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;

Collaborative Innovation Center of Quantum Matter,Beijing 100084;

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049;

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;

Collaborative Innovation Center of Quantum Matter,Beijing 100084;

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049;

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Circular Photogalvanic Effect in the Weyl Semimetal TaAs

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