Deformation Potentials and Electron-Phonon Coupling in Silicon Nanowires
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| Format: | Preprint |
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2010
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| _version_ | 1866912211737247744 |
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| author | Murphy-Armando, F. Fagas, G. Greer, J. C. |
| author_facet | Murphy-Armando, F. Fagas, G. Greer, J. C. |
| contents | The role of reduced dimensionality and of the surface on electron-phonon (e-ph) coupling in silicon nanowires is determined from first principles. Surface termination and chemistry is found to have a relatively small influence, whereas reduced dimensionality fundamentally alters the behavior of deformation potentials. As a consequence, electron coupling to "breathing modes" emerges that cannot be described by conventional treatments of e-ph coupling. The consequences for physical properties such as scattering lengths and mobilities are significant: the mobilities for [110] grown wires are 6 times larger than those for [100] wires, an effect that cannot be predicted without the form we find for Si nanowire deformation potentials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1002_0719 |
| institution | arXiv |
| publishDate | 2010 |
| record_format | arxiv |
| spellingShingle | Deformation Potentials and Electron-Phonon Coupling in Silicon Nanowires Murphy-Armando, F. Fagas, G. Greer, J. C. Materials Science Mesoscale and Nanoscale Physics The role of reduced dimensionality and of the surface on electron-phonon (e-ph) coupling in silicon nanowires is determined from first principles. Surface termination and chemistry is found to have a relatively small influence, whereas reduced dimensionality fundamentally alters the behavior of deformation potentials. As a consequence, electron coupling to "breathing modes" emerges that cannot be described by conventional treatments of e-ph coupling. The consequences for physical properties such as scattering lengths and mobilities are significant: the mobilities for [110] grown wires are 6 times larger than those for [100] wires, an effect that cannot be predicted without the form we find for Si nanowire deformation potentials. |
| title | Deformation Potentials and Electron-Phonon Coupling in Silicon Nanowires |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/1002.0719 |