Origin of nonlinear photocurrents in chiral multifold semimetal CoSi unveiled by terahertz emission spectroscopy
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866916393568436224 |
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| author | Chan, Yao-Jui Faizanuddin, Syed Mohammed Kalaivanan, Raju Raman, Sankar Lin, Hsin Kar, Uddipta Singh, Akhilesh Kr. Lee, Wei-Li Vankayala, Ranganayakulu K. Ou, Min-Nan Wen, Yu-Chieh |
| author_facet | Chan, Yao-Jui Faizanuddin, Syed Mohammed Kalaivanan, Raju Raman, Sankar Lin, Hsin Kar, Uddipta Singh, Akhilesh Kr. Lee, Wei-Li Vankayala, Ranganayakulu K. Ou, Min-Nan Wen, Yu-Chieh |
| contents | Spectroscopic identification of distinct nonlinear photocurrents unveils quantum geometric properties of electron wavefunctions and the momentum-space topological structures. This is especially interesting, but still puzzling, for chiral topological semimetals with possibilities of hosting giant quantized circular photogalvanic effect. Here we report a comprehensive terahertz (THz) emission spectroscopic analysis of nonlinear photoconductivity of chiral multifold CoSi at 0.26 ~ 1 eV. We find a large linear shift conductivity (17 μA/V2), and confirm a giant injection conductivity (167 μA/V2) as a consequence of strongly interfered non-quantized contributions from the vicinity of multifold nodes with opposite chiralities. The bulk injection current excited by the pump field with a complex wavevector is shown to carry both longitudinal and transverse components. Symmetry analyses further unveil weak nonlocal photon drag effect in addition to the photogalvanic effect. This work not only highlights chiral transition metal monosilicides for mid-infrared photovoltaic applications via various nonlinear optical channels, but also consolidates the THz spectroscopy for quantitative photovoltaic research. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_05424 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Origin of nonlinear photocurrents in chiral multifold semimetal CoSi unveiled by terahertz emission spectroscopy Chan, Yao-Jui Faizanuddin, Syed Mohammed Kalaivanan, Raju Raman, Sankar Lin, Hsin Kar, Uddipta Singh, Akhilesh Kr. Lee, Wei-Li Vankayala, Ranganayakulu K. Ou, Min-Nan Wen, Yu-Chieh Optics Materials Science Spectroscopic identification of distinct nonlinear photocurrents unveils quantum geometric properties of electron wavefunctions and the momentum-space topological structures. This is especially interesting, but still puzzling, for chiral topological semimetals with possibilities of hosting giant quantized circular photogalvanic effect. Here we report a comprehensive terahertz (THz) emission spectroscopic analysis of nonlinear photoconductivity of chiral multifold CoSi at 0.26 ~ 1 eV. We find a large linear shift conductivity (17 μA/V2), and confirm a giant injection conductivity (167 μA/V2) as a consequence of strongly interfered non-quantized contributions from the vicinity of multifold nodes with opposite chiralities. The bulk injection current excited by the pump field with a complex wavevector is shown to carry both longitudinal and transverse components. Symmetry analyses further unveil weak nonlocal photon drag effect in addition to the photogalvanic effect. This work not only highlights chiral transition metal monosilicides for mid-infrared photovoltaic applications via various nonlinear optical channels, but also consolidates the THz spectroscopy for quantitative photovoltaic research. |
| title | Origin of nonlinear photocurrents in chiral multifold semimetal CoSi unveiled by terahertz emission spectroscopy |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2409.05424 |