Interfacial thermal resonance in an SiC–SiC nanogap with various atomic surface terminations

Despite recent experiments exhibiting an impressive enhancement in radiative heat flux between parallel planar silica surfaces with gap sizes of about 10 nm, the exploration of sub-nanometric gap distances remains unexplored. In this work, by employing non-equilibrium molecular dynamics (NEMD) simulations, we study the heat transfer between two SiO2 plates in both their amorphous and crystalline forms. When the gap size is 2 nm, we find that the heat transfer coefficient experiences a substantial ∼30-fold increase compared to the experimental value at the gap size of 10 nm confirming the dependence on the distance inversely quadratic as predicted by the fluctuational electrodynamics (FE) theory. Comparative analysis between NEMD and FE reveals a generally good agreement, particularly for amorphous silica. Spectral heat transfer analysis demonstrates the profound influence of gap size on heat transfer, with peaks corresponding to the resonances of dielectric function. Deviations from the fluctuational electrodynamics theory at smaller gap sizes are interpreted in the context of acoustic phonon tunneling and the effects of a gradient of permittivity close to the surfaces.

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Enhanced thermal conductance at interfaces between gold and amorphous silicon and between gold and amorphous silica

El Hajj,

Adessi,

de San Feliciano

et al. 2024

Phys. Rev. B

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Interfacial thermal resonance in an SiC–SiC nanogap with various atomic surface terminations

Abstract: Quasi-Casimir coupling can induce phonon heat transfer across a sub-nanometer vacuum gap between monoatomic solid walls without electromagnetic fields. However, it remains unclear how the atomic surface terminations in diatomic...

Cited by 3 publications

References 68 publications

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Excessive local heat flux at resonant interfacial layers

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Enhanced thermal conductance at interfaces between gold and amorphous silicon and between gold and amorphous silica

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