Physics – Quantum Physics
Scientific paper
1998-11-24
Physics
Quantum Physics
7 pages, using RevTeX, 4 figures
Scientific paper
10.1103/PhysRevA.60.1590
A recently developed scheme [S. Scheel, L. Knoll, and D.-G. Welsch, Phys. Rev. A 58, 700 (1998)] for quantizing the macroscopic electromagnetic field in linear dispersive and absorbing dielectrics satisfying the Kramers-Kronig relations is used to derive the quantum local-field correction for the standard virtual-sphere-cavity model. The electric and magnetic local-field operators are shown to be consistent with QED only if the polarization noise is fully taken into account. It is shown that the polarization fluctuations in the local field can dramatically change the spontaneous decay rate, compared with the familiar result obtained from the classical local-field correction. In particular, the spontaneous emission rate strongly depends on the radius of the local-field virtual cavity.
Barnett Stephem M.
Knoll Ludwig
Scheel Stefan
Welsch Dirk-Gunnar
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