Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.223003
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Funding
- U.K. Engineering and Physical Sciences Research Council
- European Science Foundation
- EPSRC [EP/H012443/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H012443/1, GR/T01273/01] Funding Source: researchfish
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We demonstrate that Casimir-Polder potentials can be entirely independent of temperature even when allowing for the relevant thermal photon numbers to become large. This statement holds for potentials that are due to low-energy transitions of a molecule placed near a plane metal surface whose plasma frequency is much larger than any atomic resonance frequencies. For a molecule in an energy eigenstate, the temperature independence is a consequence of strong cancellations between nonresonant potential components and those due to evanescent waves. For a molecule with a single dominant transition in a thermal state, upward and downward transitions combine to form a temperature-independent potential. The results are contrasted with the case of an atom whose potential exhibits a regime of linear temperature dependence. Contact with the Casimir force between a weakly dielectric and a metallic plate is made.
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