Coupled electron-phonon hydrodynamics in two-dimensional semiconductors
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866915030850600960 |
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| author | Quan, Yujie Liao, Bolin |
| author_facet | Quan, Yujie Liao, Bolin |
| contents | Electronic and thermal transport properties in two-dimensional (2D) semiconductors have been extensively investigated due to their potential to miniaturize transistors. Microscopically, electron-phonon interactions are considered the dominant momentum relaxation mechanism for electrons that limits carrier mobility beyond cryogenic temperatures. However, when electrons and phonons are considered as a single system, electron-phonon interactions conserve the total momentum and energy, leading to the possibility of low-dissipation transport. In this work, we systematically investigate the momentum circulation between electrons and phonons and its impact on carrier transport properties in 2D semiconductors given their strong electron-phonon interactions. We find that, when momentum circulation is taken into account, the total momentum in the coupled electron-phonon system is weakly dissipated, leading to a coupled electron-phonon hydrodynamic transport regime, in which electrons and phonons exhibit a joint drift motion rather than separate diffusive behaviors. In this new transport regime, charge transport properties are significantly enhanced. Contrary to previous belief, our results demonstrate that low-dissipation charge transport can occur despite strong electron-phonon interactions when there is effective momentum circulation between electrons and phonons mediated by the strong interactions. Our work advances fundamental understandings of carrier transport in 2D semiconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_14649 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coupled electron-phonon hydrodynamics in two-dimensional semiconductors Quan, Yujie Liao, Bolin Mesoscale and Nanoscale Physics Materials Science Electronic and thermal transport properties in two-dimensional (2D) semiconductors have been extensively investigated due to their potential to miniaturize transistors. Microscopically, electron-phonon interactions are considered the dominant momentum relaxation mechanism for electrons that limits carrier mobility beyond cryogenic temperatures. However, when electrons and phonons are considered as a single system, electron-phonon interactions conserve the total momentum and energy, leading to the possibility of low-dissipation transport. In this work, we systematically investigate the momentum circulation between electrons and phonons and its impact on carrier transport properties in 2D semiconductors given their strong electron-phonon interactions. We find that, when momentum circulation is taken into account, the total momentum in the coupled electron-phonon system is weakly dissipated, leading to a coupled electron-phonon hydrodynamic transport regime, in which electrons and phonons exhibit a joint drift motion rather than separate diffusive behaviors. In this new transport regime, charge transport properties are significantly enhanced. Contrary to previous belief, our results demonstrate that low-dissipation charge transport can occur despite strong electron-phonon interactions when there is effective momentum circulation between electrons and phonons mediated by the strong interactions. Our work advances fundamental understandings of carrier transport in 2D semiconductors. |
| title | Coupled electron-phonon hydrodynamics in two-dimensional semiconductors |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2411.14649 |