Theory of Non-Linear Electron Relaxation in Thin Gold Films and Their Signatures in Optical Observables
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866916710004555776 |
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| author | Grumm, Jonas Selig, Malte Lange, Holger Knorr, Andreas |
| author_facet | Grumm, Jonas Selig, Malte Lange, Holger Knorr, Andreas |
| contents | Based on the momentum-resolved Boltzmann equation, we provide self-consistent numerical calculations of the dynamics of conduction electrons in thin noble metal films after linear and non-linear optical excitations with infrared and terahertz frequencies. Focusing exclusively on electron-phonon interaction, orientational relaxation is introduced and acts as dephasing of the optical excitation on a scale of tens of fs. In the linear regime, our numerical results agree with the experimental fits to a Drude model and predicts for non-linear excitations a field strength dependency of the orientational relaxation rate. In the THz regime, where the orientational relaxation proceeds faster than the oscillation cycle of the excitation THz field, a new high order dissipative Kerr-type non-linearity is predicted. This non-linearity originates from the Pauli blocking included in the electron-phonon scattering and results in a non-linearly increasing transmission of the film, detectable in experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_19733 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Theory of Non-Linear Electron Relaxation in Thin Gold Films and Their Signatures in Optical Observables Grumm, Jonas Selig, Malte Lange, Holger Knorr, Andreas Mesoscale and Nanoscale Physics Based on the momentum-resolved Boltzmann equation, we provide self-consistent numerical calculations of the dynamics of conduction electrons in thin noble metal films after linear and non-linear optical excitations with infrared and terahertz frequencies. Focusing exclusively on electron-phonon interaction, orientational relaxation is introduced and acts as dephasing of the optical excitation on a scale of tens of fs. In the linear regime, our numerical results agree with the experimental fits to a Drude model and predicts for non-linear excitations a field strength dependency of the orientational relaxation rate. In the THz regime, where the orientational relaxation proceeds faster than the oscillation cycle of the excitation THz field, a new high order dissipative Kerr-type non-linearity is predicted. This non-linearity originates from the Pauli blocking included in the electron-phonon scattering and results in a non-linearly increasing transmission of the film, detectable in experiments. |
| title | Theory of Non-Linear Electron Relaxation in Thin Gold Films and Their Signatures in Optical Observables |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2504.19733 |