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arXiv 1003.0068cond-mat.stat-mech
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球和板之间的量子和热Casimir相互作用:Drude模型和等离子体模型的比较

Quantum and thermal Casimir interaction between a sphere and a plate: Comparison of Drude and plasma models

Roya Zandi, Thorsten Emig, Umar Mohideen

摘要:

我们计算Casimir相互作用之间的球体和板,都描述了等离子体模型,Drude模型,或概括的两个模型。我们比较了零温度和有限温度下的结果。在渐近大的分离,我们得到的相互作用,揭示了一个非普遍的分析结果,即,等离子体模型的材料相关相互作用。后一个结果包含了Drude金属和完美反射体作为不同但普遍的极限情况的渐近相互作用。这一观察结果与伦敦超导体对静态磁场的屏蔽有关。对于小的分离,我们发现修正的邻近力近似(PFA),支持几何形状和材料性质之间的相关性,没有捕获的Lifshitz理论。我们的结果在有限的温度下揭示德鲁德金属的Casimir自由能和负熵在相当大的范围内的分离的非单调的温度依赖性。

英文摘要:

We calculate the Casimir interaction between a sphere and a plate, both described by the plasma model, the Drude model, or generalizations of the two models. We compare the results at both zero and finite temperatures. At asymptotically large separations we obtain analytical results for the interaction that reveal a non-universal, i.e., material dependent interaction for the plasma model. The latter result contains the asymptotic interaction for Drude metals and perfect reflectors as different but universal limiting cases. This observation is related to the screening of a static magnetic field by a London superconductor. For small separations we find corrections to the proximity force approximation (PFA) that support correlations between geometry and material properties that are not captured by the Lifshitz theory. Our results at finite temperatures reveal for Drude metals a non-monotonic temperature dependence of the Casimir free energy and a negative entropy over a sizeable range of separations.

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