Positive Terahertz Photoconductivity in CdHgTe Under Hydrostatic Pressure
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908469853945856 |
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| author | Yahniuk, Ivan Kozlov, Dmitriy A. Moldavskaya, Mariya D. Golub, Leonid E. Bel'kov, Vasily V. Dmitriev, Ivan A. Krishtopenko, Sergey S. Teppe, Frederic Ivonyak, Yurii Bercha, Artem Cywiński, Grzegorz Knap, Wojciech Ganichev, Sergey D. |
| author_facet | Yahniuk, Ivan Kozlov, Dmitriy A. Moldavskaya, Mariya D. Golub, Leonid E. Bel'kov, Vasily V. Dmitriev, Ivan A. Krishtopenko, Sergey S. Teppe, Frederic Ivonyak, Yurii Bercha, Artem Cywiński, Grzegorz Knap, Wojciech Ganichev, Sergey D. |
| contents | Positive terahertz photoconductivity is observed at room temperature in CdHgTe thin films with different Cd contents. We show that electron gas heating caused by Drude-like absorption results in positive photoconductivity because of the interband activation mechanism specific for undoped narrow-gap semiconductors and semimetals. Applying intense terahertz radiation, we observed that the photoconductivity saturates at high intensities, which was found to be caused by absorption bleaching. Both the magnitude of the photoconductivity and the saturation intensity are shown to exhibit an exponential dependence on the hydrostatic pressure. We show that this is a consequence of the fact that both phenomena are controlled by the ratio of energy and momentum relaxation times. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_08319 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Positive Terahertz Photoconductivity in CdHgTe Under Hydrostatic Pressure Yahniuk, Ivan Kozlov, Dmitriy A. Moldavskaya, Mariya D. Golub, Leonid E. Bel'kov, Vasily V. Dmitriev, Ivan A. Krishtopenko, Sergey S. Teppe, Frederic Ivonyak, Yurii Bercha, Artem Cywiński, Grzegorz Knap, Wojciech Ganichev, Sergey D. Mesoscale and Nanoscale Physics Positive terahertz photoconductivity is observed at room temperature in CdHgTe thin films with different Cd contents. We show that electron gas heating caused by Drude-like absorption results in positive photoconductivity because of the interband activation mechanism specific for undoped narrow-gap semiconductors and semimetals. Applying intense terahertz radiation, we observed that the photoconductivity saturates at high intensities, which was found to be caused by absorption bleaching. Both the magnitude of the photoconductivity and the saturation intensity are shown to exhibit an exponential dependence on the hydrostatic pressure. We show that this is a consequence of the fact that both phenomena are controlled by the ratio of energy and momentum relaxation times. |
| title | Positive Terahertz Photoconductivity in CdHgTe Under Hydrostatic Pressure |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2504.08319 |