Spectroscopy of Heat Transport and Violation of the Wiedemann--Franz Law in a GaAs Hydrodynamic Mesoscopic Channel
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866908964220829696 |
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| author | Pusep, Yu. A. Patricio, M. A. T. Glazov, M. M. Oliveira, V. A. Teodoro, M. D. Levin, A. D. Bakarov, A. K. Gusev, G. M. |
| author_facet | Pusep, Yu. A. Patricio, M. A. T. Glazov, M. M. Oliveira, V. A. Teodoro, M. D. Levin, A. D. Bakarov, A. K. Gusev, G. M. |
| contents | The Wiedemann--Franz law, which determines the universality of the ratio of thermal conductivity to electrical conductivity, is studied in the hydrodynamic electron transport regime, where electron--electron scattering predominates over scattering by disorder. In this case, the different relaxation of electric and thermal currents can lead to a violation of the Wiedemann--Franz law, which is expected to be even more pronounced in mesoscopic electron systems. This paper reports the propagation of hot electrons in a GaAs hydrodynamic narrow channel, studied using micrometer-resolution photoluminescence thermometry. A temperature dependence of the Lorenz number was obtained, indicating a violation of the Wiedemann--Franz law. The important role of narrow constrictions in this violation was also demonstrated, and theoretical arguments are presented. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_12943 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spectroscopy of Heat Transport and Violation of the Wiedemann--Franz Law in a GaAs Hydrodynamic Mesoscopic Channel Pusep, Yu. A. Patricio, M. A. T. Glazov, M. M. Oliveira, V. A. Teodoro, M. D. Levin, A. D. Bakarov, A. K. Gusev, G. M. Mesoscale and Nanoscale Physics The Wiedemann--Franz law, which determines the universality of the ratio of thermal conductivity to electrical conductivity, is studied in the hydrodynamic electron transport regime, where electron--electron scattering predominates over scattering by disorder. In this case, the different relaxation of electric and thermal currents can lead to a violation of the Wiedemann--Franz law, which is expected to be even more pronounced in mesoscopic electron systems. This paper reports the propagation of hot electrons in a GaAs hydrodynamic narrow channel, studied using micrometer-resolution photoluminescence thermometry. A temperature dependence of the Lorenz number was obtained, indicating a violation of the Wiedemann--Franz law. The important role of narrow constrictions in this violation was also demonstrated, and theoretical arguments are presented. |
| title | Spectroscopy of Heat Transport and Violation of the Wiedemann--Franz Law in a GaAs Hydrodynamic Mesoscopic Channel |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.12943 |