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arXiv quant-ph/0612182quant-ph
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单原子和双原子范德华相互作用的局域场修正

Local-field correction to one- and two-atom van der Waals interactions

Agnes Sambale, Stefan Yoshi Buhmann, Dirk-Gunnar Welsch, Marin-Slodoban Tomas

摘要:

基于线性和因果响应介质中的宏观量子电动力学,研究了任意大小和形状的磁电介质中非极化基态原子的局域场修正的范德华势和范德华力.我们开始从一般表达式的范德华势的(经典)格林张量的电磁场和原子的极化率,并纳入本地场校正的手段,真正的腔模型。在这种情况下,特别强调的是分解的格林张量到一个介质部分乘以一个全球的本地场校正因子,在单原子的情况下,一个部分,只取决于腔的特性。利用这一结果导出了局域场修正的范德华势和力的一般公式。作为应用,我们计算了磁电体材料中两个基态原子间的范德华势。

英文摘要:

Based on macroscopic quantum electrodynamics in linearly and causally responding media, we study the local-field corrected van der Waals potentials and forces for unpolarized ground-state atoms placed within a magnetoelectric medium of arbitrary size and shape. We start from general expressions for the van der Waals potentials in terms of the (classical) Green tensor of the electromagnetic field and the atomic polarizability and incorporate the local-field correction by means of the real-cavity model. In this context, special emphasis is given to the decomposition of the Green tensor into a medium part multiplied by a global local-field correction factor and, in the single-atom case, a part that only depends on the cavity characteristics. The result is used to derive general formulas for the local-field corrected van der Waals potentials and forces. As an application, we calculate the van der Waals potential between two ground-state atoms placed within magnetoelectric bulk material.

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