Atom-wall dispersive forces: a microscopic approach

Details Atom-wall dispersive forces: a microscopic approach Atom-wall dispersive forces: a microscopic approach

2009-09-07

arxiv.org/abs/0909.1016v2

Physics

Quantum Physics

4 figures

Scientific paper

We present a study of atom-wall interactions in non-relativistic quantum electrodynamics by functional integral methods. The Feynman-Kac path integral representation is generalized to the case when the particle interacts with a radiation field, providing an additional effective potential that contains all the interactions induced by the field. We show how one can retrieve the standard van der Waals, Casimir-Polder and classical Lifshiftz forces in this formalism for an atom in its ground state. Moreover, when electrostatic interactions are screened in the medium, we find low temperature corrections that are not included in the Lifshitz theory of fluctuating forces and are opposite to them.

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