Physics – Quantum Physics
Scientific paper
1999-04-06
Physics
Quantum Physics
28 pages, 6 figures, typeset using RevTeX
Scientific paper
10.1103/PhysRevA.60.4094
Starting from the quantized version of Maxwell's equations for the electromagnetic field in an arbitrary linear Kramers-Kronig dielectric, spontaneous decay of the excited state of a two-level atom embedded in a dispersive and absorbing medium is studied and the decay rate is calculated. The calculations are performed for both the (Clausius-Mosotti) virtual cavity model and the (Glauber-Lewenstein) real cavity model. It is shown that owing to nonradiative decay associated with absorption the rate of spontaneous decay sensitively depends on the cavity radius when the atomic transition frequency approaches an absorption band of the medium. Only when the effect of absorption is fully disregarded, then the familiar local-field correction factors are recovered.
Knoll Ludwig
Scheel Stefan
Welsch Dirk-Gunnar
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