Capacitor physics in ultra-near-field heat transfer

Abstract

Using the nonequilibrium Green's function (NEGF) formalism, we propose a microscopic theory for near-field heat transfer between charged metal plates focusing on the Coulomb interactions. Tight-binding models for the electrons are coupled to the electromagnetic field continuum through a scalar potential. Our approach differs from the established ones based on Rytov fluctuational electrodynamics, which deals with the transverse radiative field and vector potential. For a two quantum-dot model a new length scale emerges below which the heat current exhibits great enhancement. This length scale is related to the physics of parallel plate capacitors. At long distances $d$, the energy flux decreases as $1/d^2$.

5 pages. arXiv admin note: substantial text overlap with arXiv:1607.02840

References in corpus (6)

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• Ultrafast Radiative Heat Transfer
• Non-equilibrium Fluctuational Quantum Electrodynamics: Heat Radiation, Heat Transfer, and Force
• Coupled electron and phonon transport in one-dimensional atomic junctions
• Theory and simulation of quantum photovoltaic devices based on the non-equilibrium Green's function formalism
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