Casimir-Polder interaction of atoms with magnetodielectric bodies |
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Authors: | Email author" target="_blank">S Y?BuhmannEmail author H T?Dung T?Kampf D-G?Welsch |
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Institution: | (1) Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany;(2) Institute of Physics, National Center for Sciences and Technology, 1 Mac Dinh Chi Street, District 1, Ho Chi Minh city, Vietnam;(3) Fachbereich Physik, Universität Rostock, Universitätsplatz 3, 18051 Rostock, Germany |
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Abstract: | A general theory of the Casimir-Polder interaction of single atoms
with dispersing and absorbing magnetodielectric bodies is presented,
which is based on QED in linear, causal media. Both ground-state and
excited atoms are considered. Whereas the Casimir-Polder force acting
on a ground-state atom can conveniently be derived from a perturbative
calculation of the atom-field coupling energy, an atom in an excited
state is subject to transient force components that can only be fully
understood by a dynamical treatment based on the body-assisted vacuum
Lorentz force. The results show that the Casimir-Polder force can be
influenced by the body-induced broadening and shifting of atomic
transitions — an effect that is not accounted for within lowest-order
perturbation theory. The theory is used to study the Casimir-Polder
force of a ground-state atom placed within a magnetodielectric
multilayer system, with special emphasis on thick and thin plates as
well as a planar cavity consisting of two thick plates. It is shown
how the competing attractive and repulsive force components related to
the electric and magnetic properties of the medium, respectively,
can — for sufficiently strong magnetic properties — lead to the
formation of
potential walls and wells. |
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Keywords: | |
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