Temperature-independent Casimir-Polder forces in arbitrary geometries

Details Temperature-independent Casimir-Polder forces in arbitrary geometries Temperature-independent Casimir-Polder forces in arbitrary geometries

2011-06-24

arxiv.org/abs/1106.5015v1

Phys. Rev. A 84, 060501(R) (2011)

Physics

Quantum Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevA.84.060501

We show that the Casimir-Polder potential of a particle in an energy eigenstate at nonretarded distance from a well-conducting body of arbitrary shape is independent of the environment temperature. This is true even when the thermal photon numbers at the relevant atomic transition energies are large. A compact expression is obtained for the temperature-independent potential, which can greatly simplify calculations in nontrivial geometries for experimentally relevant systems such as Rydberg atoms and polar molecules. We give criteria for the validity of our temperature-independent result. They are illustrated by numerical studies of a particle near a gold sphere or inside a gold cylindrical cavity.

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