Classical to quantum transition of near-field heat transfer between two nanoparticles

Abstract

Heat transfer between two silica clusters is investigated by using the non-equilibrium Green's function method. In the gap range between 4 Å and three times the cluster size, the thermal conductance decreases as predicted by the surface charge-charge interaction. Above five times the cluster size, the volume dipole-dipole interaction predominates. Finally, when the distance becomes smaller than 4 Å, a quantum interaction where the electrons of both clusters are shared takes place. This quantum interaction leads to the dramatic increase of the thermal coupling between neighbor clusters due to strong interactions. This study finally provides a description of the transition between radiation and heat conduction in gaps smaller than a few nanometers.

References in corpus (6)

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• Enhanced thermoelectric properties in hybrid graphene-boron nitride nanoribbons
• Radiative heat transfer between metallic nanoparticles
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• Near field radiative heat transfer between two nonlocal dielectrics
• First-principles calculations of phonon transport across a vacuum gap
• Capacitor physics in ultra-near-field heat transfer
• Heat transfer statistics in extreme-near-field radiation
• Atomistic modeling of extreme near-field heat transport across nanogaps between two polar dielectric materials
• Extreme near-field heat transfer between silica surfaces
• Complete tunneling of acoustic waves between closely spaced piezoelectric crystals
• Crystal Orientation Dependence of Extreme Near-Field Heat Transfer between Polar Materials Governed by Surface Phonon Modes
• Generalized first-principles method to study near-field heat transfer mediated by Coulomb interaction