Generalizing Planck's Law: Nonequilibrium Emission of Excited Media

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dc.creatorHenneberger, Klaus
dc.date2007-10-30
dc.date2009-01-19
dc.date.accessioned2026-07-07T12:30:50Z
dc.date.available2026-07-07T12:30:50Z
dc.descriptionUsing a quantum-kinetic many-body approach, exact results for the interacting system of field and matter in a specified geometry are presented. It is shown that both the spectral function of photons and the field fluctuations split up into vacuum- and medium-induced contributions, for which explicit expressions are derived. Using Poynting's theorem, the incoherent emission is analyzed and related to the coherent absorption as may be measured in a linear transmission-reflection experiment. Their ratio defines the medium-induced population of the modes of the transverse electromagnetic field and so generalizes Planck's law to an arbitrarily absorbing and dispersing medium in a nonequilibrium steady state. For quasi-equilibrium, this population develops into a Bose distribution whose chemical potential marks the crossover from absorption to gain and, also, characterizes the degree of excitation. Macroscopic quantum phenomena such as lasing and quantum condensation are discussed on this footing.
dc.descriptionminor corrections and extended discussion, as published
dc.identifierhttps://arxiv.org/abs/0710.5686
dc.identifierhttp://arxiv.org/abs/0710.5686
dc.identifierPhys. Status Solidi B 246, 283--288 (2009)
dc.identifierdoi:10.1002/pssb.200880349
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216256
dc.subjectStrongly Correlated Electrons
dc.subjectOptics
dc.titleGeneralizing Planck's Law: Nonequilibrium Emission of Excited Media
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