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PreprintCC BY 4.0arXiv

Breakdown of Fluctuational Electrodynamics in the Extreme Near Field

  • Philippe Ben-Abdallah
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Abstract

Fluctuational electrodynamics relies on the assumption that thermal fluctuations in distinct bodies are statistically independent. It is shown that this approximation breaks down in the extreme near-field regime, where hybridization of surface phonon-polaritons across nanometric vacuum gaps generates finite fluctuating-current cross correlations between opposite interfaces. Using a microscopic coupled-oscillator model combined with a Green-tensor formulation of the Poynting vector, the resulting correlation-induced correction to radiative heat transfer is derived. For polar materials, these correlations become significant when the hybridization energy approaches the intrinsic damping rate and can substantially modify conventional fluctuational-electrodynamics predictions at subnanometric separations.

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Cite

BibTeXRIS
BibTeX
@misc{benabdallah2026breakdown,
  title = {{Breakdown of Fluctuational Electrodynamics in the Extreme Near Field}},
  author = {Philippe Ben-Abdallah},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.05845},
  eprint = {2606.05845},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.05845},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Breakdown of Fluctuational Electrodynamics in the Extreme Near Field
AU  - Philippe Ben-Abdallah
PY  - 2026
DA  - 2026/10/12
PB  - arXiv
DO  - 10.48550/arxiv.2606.05845
UR  - https://arxiv.org/abs/2606.05845
AB  - Fluctuational electrodynamics relies on the assumption that thermal fluctuations in distinct bodies are statistically independent. It is shown that this approximation breaks down in the extreme near-field regime, where hybridization of surface phonon-polaritons across nanometric vacuum gaps generates finite fluctuating-current cross correlations between opposite interfaces. Using a microscopic coupled-oscillator model combined with a Green-tensor formulation of the Poynting vector, the resulting correlation-induced correction to radiative heat transfer is derived. For polar materials, these correlations become significant when the hybridization energy approaches the intrinsic damping rate and can substantially modify conventional fluctuational-electrodynamics predictions at subnanometric separations.
ER  -