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arXiv 0908.3790quant-phphysics.atom-ph
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热浴中边界的存在和Casimir-Polder力对原子能移的修正

Modification of energy shifts of atoms by the presence of a boundary in a thermal bath and the Casimir-Polder force

Zhiying Zhu, Hongwei Yu

备注：
29 pages, 3 figures
发表信息：
Phys. Rev. A 79, 032902 (2009
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摘要：

本文研究了热浴中与量子化电磁场多极耦合的二能级原子的能级位移在平面壁存在下的变化，该形式分离了热涨落和辐射反应的贡献，并对基态和激发态的原子作了不同的处理。位置相关的能量移动引起作用在原子上的诱导力。我们能够确定三个不同的制度，其中的力显示出不同的功能和检查，在所有的制度，这种力的行为在低温极限和高温极限的基态和激发态原子，从而提供了一些物理见解，在有限温度下的原子壁相互作用。特别地，我们证明了作用在原子上的力的大小和方向都可能与原子的极化方向有明显的依赖关系。在某些情况下，不同方向上的偏振的相对比率的变化可能导致力的方向的变化。

英文摘要：

We study the modification by the presence of a plane wall of energy level shifts of two-level atoms which are in multipolar coupling with quantized electromagnetic fields in a thermal bath in a formalism which separates the contributions of thermal fluctuations and radiation reaction and allows a distinct treatment to atoms in the ground and excited states. The position dependent energy shifts give rise to an induced force acting on the atoms. We are able to identify three different regimes where the force shows distinct features and examine, in all regimes, the behaviors of this force in both the low temperature limit and the high temperature limit for both the ground state and excited state atoms, thus providing some physical insights into the atom-wall interaction at finite temperature. In particular, we show that both the magnitude and the direction of the force acting on an atom may have a clear dependence on atomic the polarization directions. In certain cases, a change of relative ratio of polarizations in different directions may result in a change of direction of the force.

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