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

doi:10.1038/s41467-022-33190-3

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	Unveiling Weyl-related optical responses in semiconducting tellurium by mid-infrared circular photogalvanic effect
	J. C. Ma; B. Cheng; L. Li; Z. P. Fan; H. M. Mu; J. W. Lai; X. M. Song; D. H. Yang; J. L. Cheng; Z. F. Wang; C. G. Zeng and D. Sun
	2022
发表期刊	Nature Communications
卷号	13 期号:1 页码:7
摘要	Materials with Weyl cones and band gaps coexisting are desired due to their combination of Weyl cones and the tunable and controllable nature of semiconductor. Here, the authors find Weyl-related band structures and semiconducting gap of tellurium. 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.
DOI	10.1038/s41467-022-33190-3
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收录类别	sci
语种	英语
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/67221
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	J. C. Ma,B. Cheng,L. Li,et al. Unveiling Weyl-related optical responses in semiconducting tellurium by mid-infrared circular photogalvanic effect[J]. Nature Communications,2022,13(1):7.
APA	J. C. Ma.,B. Cheng.,L. Li.,Z. P. Fan.,H. M. Mu.,...&C. G. Zeng and D. Sun.(2022).Unveiling Weyl-related optical responses in semiconducting tellurium by mid-infrared circular photogalvanic effect.Nature Communications,13(1),7.
MLA	J. C. Ma,et al."Unveiling Weyl-related optical responses in semiconducting tellurium by mid-infrared circular photogalvanic effect".Nature Communications 13.1(2022):7.

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