Charge and Current Sum Rules in Quantum Media Coupled to Radiation

Details Charge and Current Sum Rules in Quantum Media Coupled to Radiation Charge and Current Sum Rules in Quantum Media Coupled to Radiation

2009-06-30

arxiv.org/abs/0906.5536v2

J. Stat. Phys. 137 (2009) 1-17

Physics

Condensed Matter

Statistical Mechanics

19 pages, 1 figure

Scientific paper

10.1007/s10955-009-9845-7

This paper concerns the equilibrium bulk charge and current density correlation functions in quantum media, conductors and dielectrics, fully coupled to the radiation (the retarded regime). A sequence of static and time-dependent sum rules, which fix the values of certain moments of the charge and current density correlation functions, is obtained by using Rytov's fluctuational electrodynamics. A technique is developed to extract the classical and purely quantum-mechanical parts of these sum rules. The sum rules are critically tested in the classical limit and on the jellium model. A comparison is made with microscopic approaches to systems of particles interacting through Coulomb forces only (the non-retarded regime). In contrast with microscopic results, the current-current correlation function is found to be integrable in space, in both classical and quantum regimes.

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