Macroscopic QED and noise currents in time-varying media
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913519102853120 |
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| author | Horsley, S. A. R. Baker, R. K. |
| author_facet | Horsley, S. A. R. Baker, R. K. |
| contents | Macroscopic QED (MQED) is the field theory for computing quantum electromagnetic effects in dispersive media. Here we extend MQD to treat time-varying, dispersive media. For a time dependent Drude model, we find that the expected replacement $ε(ω) {\to} ε(t,ω)$ within standard MQED leads to nonphysical polarization currents, becoming singular in the limit of a step change in the carrier density. We show this singular behaviour can be removed through modifying the reservoir dynamics, quantizing the resulting theory and finding the non-equilibrium, time-varying noise currents, which exhibit extra correlations due to temporal reflections within the material dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_11873 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Macroscopic QED and noise currents in time-varying media Horsley, S. A. R. Baker, R. K. Optics Materials Science Quantum Physics Macroscopic QED (MQED) is the field theory for computing quantum electromagnetic effects in dispersive media. Here we extend MQD to treat time-varying, dispersive media. For a time dependent Drude model, we find that the expected replacement $ε(ω) {\to} ε(t,ω)$ within standard MQED leads to nonphysical polarization currents, becoming singular in the limit of a step change in the carrier density. We show this singular behaviour can be removed through modifying the reservoir dynamics, quantizing the resulting theory and finding the non-equilibrium, time-varying noise currents, which exhibit extra correlations due to temporal reflections within the material dynamics. |
| title | Macroscopic QED and noise currents in time-varying media |
| topic | Optics Materials Science Quantum Physics |
| url | https://arxiv.org/abs/2409.11873 |