Polarization-dependent photocurrent in a quadrilateral-shaped bulk crystalline tellurium chip with near-infrared light excitation
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| Format: | Preprint |
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2025
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| _version_ | 1866911281745756160 |
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| author | Munekata, Hiro Kusuno, Gakuto Miyazaki, Kohei Satoh, Takuya |
| author_facet | Munekata, Hiro Kusuno, Gakuto Miyazaki, Kohei Satoh, Takuya |
| contents | We report the detection of zero-bias photocurrents induced by interband excitation using oblique near-infrared light (λ=0.780 μm) along the directions parallel and perpendicular to the helical axis in a millimeter-sized Te crystal. The photocurrent parallel to the helical axis exhibits a circular-polarization-dependent component, namely circular photogalvanic effect. We create a framework for estimating the gyrotropic photoconductivity tensor \b{eta}, the ratio between the circular-polarization-dependent photocurrent density and intensity of light, through which extrinsic \b{eta} values ranging from a few to a few tens of nA/W are obtained. Searching the \b{eta} values through existing literatures reveals that these values vary significantly with sample conditions, excitation wavelengths, and forms of crystallite samples. A particular interesting point found in our study is that the \b{eta} values for the interband excitation may be greater than those for intraband excitation as far as bulk Te is concerned. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_00413 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polarization-dependent photocurrent in a quadrilateral-shaped bulk crystalline tellurium chip with near-infrared light excitation Munekata, Hiro Kusuno, Gakuto Miyazaki, Kohei Satoh, Takuya Materials Science We report the detection of zero-bias photocurrents induced by interband excitation using oblique near-infrared light (λ=0.780 μm) along the directions parallel and perpendicular to the helical axis in a millimeter-sized Te crystal. The photocurrent parallel to the helical axis exhibits a circular-polarization-dependent component, namely circular photogalvanic effect. We create a framework for estimating the gyrotropic photoconductivity tensor \b{eta}, the ratio between the circular-polarization-dependent photocurrent density and intensity of light, through which extrinsic \b{eta} values ranging from a few to a few tens of nA/W are obtained. Searching the \b{eta} values through existing literatures reveals that these values vary significantly with sample conditions, excitation wavelengths, and forms of crystallite samples. A particular interesting point found in our study is that the \b{eta} values for the interband excitation may be greater than those for intraband excitation as far as bulk Te is concerned. |
| title | Polarization-dependent photocurrent in a quadrilateral-shaped bulk crystalline tellurium chip with near-infrared light excitation |
| topic | Materials Science |
| url | https://arxiv.org/abs/2504.00413 |