Lifshitz theory of atom-wall interaction with applications to quantum reflection
Lifshitz theory of atom-wall interaction with applications to quantum reflection
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DOI：
10.1103/physreva.78.042901
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发表时间：
2008-10-01
影响因子：
2.9
通讯作者：
Romero, C.
中科院分区：
文献类型：
--
作者：
Bezerra, V. B.;Klimchitskaya, G. L.;Romero, C.
在Lifshitz理论的框架下研究了原子与金属壁的Casimir-Polder相互作用。证明了在某些温度（分离）区域Casimir-Polder熵取负值，当温度为零时，Casimir-Polder熵趋于零。对于理想的金属壁和真实的金属壁都可以得到这个结果。Casimir-Polder自由能和力的简单的解析表达式也得到了。这些结果被用来进行量子反射的理论描述中使用的唯象势和精确的原子壁相互作用能之间的比较，如由Lifshitz理论给出的。计算了亚稳态He-* 原子与金属（Au）和电介质（Si）壁相互作用。结果表明，在金属壁的情况下，精确的和唯象的相互作用能之间的相对差异较小。这可以用只在金属壁上发生的负熵效应来解释。计算得到的原子与壁面相互作用能可用于解释量子反射实验中的测量数据。
The Casimir-Polder interaction of an atom with a metallic wall is investigated in the framework of the Lifshitz theory. It is demonstrated that in some temperature (separation) region the Casimir-Polder entropy takes negative values and goes to zero when the temperature vanishes. This result is obtained both for an ideal metal wall and for real metal walls. Simple analytical representations for the Casimir-Polder free energy and force are also obtained. These results are used to make a comparison between the phenomenological potential used in the theoretical description of quantum reflection and exact atom-wall interaction energy, as given by the Lifshitz theory. Computations are performed for the atom of metastable He-* interacting with metal (Au) and dielectric (Si) walls. It is shown that the relative differences between the exact and phenomenological interaction energies are smaller in the case of a metallic wall. This is explained by the effect of negative entropy which occurs only for a metal wall. More accurate atom-wall interaction energies computed here can be used for the interpretation of measurement data in the experiments on quantum reflection.