Super-Planckian radiative heat transfer between coplanar two-dimensional metals
arxiv(2024)
摘要
We use the nonequilibrium Green's function formalism to investigate the
radiative heat transfer (RHT) between coplanar two-dimensional (2D) metals via
a tight-binding square lattice model and the Drude model. Our results reveal
that the RHT between coplanar 2D metals is significantly larger than black-body
radiation in both the near and far fields, leading to a global super-Planckian
RHT. As the separation distance increases, the heat flux density exhibits a
rapid decrease in the near field, followed by a slower decrease and eventual
1/d dependence in the far field, while maintaining a much higher magnitude
than black-body radiation. Evanescent waves dominate the heat transfer in the
near field, while propagating waves dominate the far field. Surprisingly, the
propagating heat flux remains almost constant over a wide range of distances,
resulting in a super-Planckian behavior in the far field. The dispersion
relation of the spectrum function reveals distinct contributions from
propagating and evanescent waves, with possible origins from surface plasmon
resonance. These findings provide insights into the unique characteristics of
RHT between coplanar 2D metals and highlight the potential for achieving
enhanced heat transfer beyond the black-body limit, with implications for
thermal management and energy conversion applications.
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