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arXiv quant-ph/0703186quant-ph
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基于主方程的原子壁色散力

Atom-wall dispersive forces from master equation formalism

T. N. C. Mendes, C. Farina

摘要:

利用由小系统与大系统相互作用的主方程得到的能级位移的一般表达式,在偶极近似下计算了原子与壁面之间的色散势。我们详细分析了一个二能级原子在一个完美的导电壁的存在下的特殊情况。我们研究了范德华力以及共振相互作用。所有的距离制度,以及高和低的温度制度被认为是。我们指出,Casimir-Polder相互作用不能仅仅被认为是真空涨落的直接结果。关于高温下原子与壁面之间的相互作用,表明在所有距离上都发生了势的饱和。这个饱和势与在伦敦-范德瓦尔斯极限中得到的完全一致。

英文摘要:

Using the general expressions for level shifts obtained from the master equation for a small system interacting with a large one considered as a reservoir, we calculate the dispersive potentials between an atom and a wall in the dipole approximation. We analyze in detail the particular case of a two-level atom in the presence of a perfectly conducting wall. We study the van der Waals as well as the resonant interactions. All distance regimes as well as the high and low temperature regimes are considered. We show that the Casimir-Polder interaction can not be considered as a direct result of the vacuum fluctuations only. Concerning the interaction between the atom and the wall at high temperature, which show that a saturation of the potential for all distances occurs. This saturated potential coincides exactly with that obtained in the London-van der Waals limit.

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