Negative Casimir entropies in nanoparticle interactions

作者：Milton Kimball A^*; Guerout Romain; Ingold Gert Ludwig; Lambrecht Astrid; Reynaud Serge

来源：Journal of Physics: Condensed Matter , 2015, 27(21): 214003.

DOI：10.1088/0953-8984/27/21/214003

• Casimir interaction
• Casimir entropy
• nanoparticle entropy
• Casimir-Polder entropy

Negative entropy has been known in Casimir systems for some time. For example, it can occur between parallel metallic plates modeled by a realistic Drude permittivity. Less well known is that negative entropy can occur purely geometrically, say between a perfectly conducting sphere and a conducting plate. The latter effect is most pronounced in the dipole approximation, which is reliable when the size of the sphere is small compared to the separation between the sphere and the plate. Therefore, here we examine cases where negative entropy can occur between two electrically and magnetically polarizable nanoparticles or atoms, which need not be isotropic, and between such a small object and a conducting plate. Negative entropy can occur even between two perfectly conducting spheres, between two electrically polarizable nanoparticles if there is sufficient anisotropy, between a perfectly conducting sphere and a Drude sphere, and between a sufficiently anisotropic electrically polarizable nanoparticle and a transverse magnetic conducting plate.

• 出版日期2015-6-3