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Thermal radiative phenomena can be strongly influenced by the coupling ofphonons and long-range electromagnetic fields at infrared frequencies.Typically employed macroscopic descriptions of thermal fluctuations tend toignore atomistic effects that become relevant at nanometric scales, whereaspurely microscopic treatments ignore long-range, geometry-dependentelectromagnetic effects. We describe a mesoscopic framework for modelingthermal fluctuation phenomena among molecules in the vicinity of macroscopicbodies, conjoining atomistic treatments of electronic and vibrationalfluctuations obtained from ab-initio density functional theory in the formerwith continuum descriptions of electromagnetic scattering in the latter. Theinterplay of these effects becomes particularly important at mesoscopic scales,where phonon polaritons can be strongly influenced by the finite sizes, shapes,and non-local/many-body response of the bodies to electromagnetic fluctuations.We show that even in small but especially in elongated low-dimensionalmolecular systems, such effects can modify thermal emission and heat transferby orders of magnitude and produce qualitatively different behavior compared topredictions based on local, dipolar, or pairwise approximations valid only indilute media.

physical review letters

Phonon-polariton mediated thermal radiation and heat transfer among  molecules and macroscopic bodies: nonlocal electromagnetic response at  mesoscopic scales