Unveiling Weyl-related optical responses in semiconducting tellurium by mid-infrared circular photogalvanic effect

Junchao Ma, Bin Cheng, Lin Li, Zipu Fan, Haimen Mu, Jiawei Lai, Xiaoming Song, Dehong Yang, Jinluo Cheng, Zhengfei Wang, Changgan Zeng () and Dong Sun ()
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Junchao Ma: Peking University
Bin Cheng: University of Science and Technology of China
Lin Li: University of Science and Technology of China
Zipu Fan: Peking University
Haimen Mu: University of Science and Technology of China
Jiawei Lai: Peking University
Xiaoming Song: Peking University
Dehong Yang: Peking University
Jinluo Cheng: Chinese Academy of Sciences
Zhengfei Wang: University of Science and Technology of China
Changgan Zeng: University of Science and Technology of China
Dong Sun: Peking University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Elemental tellurium, conventionally recognized as a narrow bandgap semiconductor, has recently aroused research interests for exploiting Weyl physics. Chirality is a unique feature of Weyl cones and can support helicity-dependent photocurrent generation, known as circular photogalvanic effect. Here, we report circular photogalvanic effect with opposite signs at two different mid-infrared wavelengths which provides evidence of Weyl-related optical responses. These two different wavelengths correspond to two critical transitions relating to the bands of different Weyl cones and the sign of circular photogalvanic effect is determined by the chirality selection rules within certain Weyl cone and between two different Weyl cones. Further experimental evidences confirm the observed response is an intrinsic second-order process. With flexibly tunable bandgap and Fermi level, tellurium is established as an ideal semiconducting material to manipulate and explore chirality-related Weyl physics in both conduction and valence bands. These results are also directly applicable to helicity-sensitive optoelectronics devices.

Date: 2022
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DOI: 10.1038/s41467-022-33190-3

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