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arXiv 0802.0126quant-ph
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磁电球存在时原子间的范德华势

Interatomic van der Waals potential in the presence of a magneto-electric sphere

Hassan Safari, Dirk-Gunnar Welsch, Ho Trung Dung, Stefan Yoshi Buhmann

摘要:

在宏观量子电动力学框架内,利用四阶微扰理论得到的一般公式,研究了均匀、色散和吸收的磁电球中两个中性、非极化、基态原子间的范德华势.当球的半径足够大时,结果与两个原子靠近平面界面时的结果渐近一致。在一个非常小的球体的相反极限中,球体可以有效地被视为第三基态原子,并且恢复了非加性的三原子范德华势。为了说明任意半径的球的效果,数值结果给出的三角形排列的原子是在等距的球,和线性排列的原子和球沿直线排列。正如所证明的,在纯电或磁球的存在下,相互作用势的增强或减小可以从物理上用像电荷来理解。

英文摘要:

On the basis of a general formula obtained earlier via fourth-order erturbation theory within the framework of macroscopic quantum electrodynamics, the van der Waals potential between two neutral, unpolarized, ground-state atoms in the presence of a homogeneous, dispersing and absorbing magnetoelectric sphere is studied. When the radius of the sphere becomes sufficiently large, the result asymptotically agrees with that for two atoms near a planar interface. In the opposite limit of a very small sphere, the sphere can effectively be regarded as being a third ground-state atom, and the nonadditive three-atom van der Waals potential is recovered. To illustrate the effect of a sphere of arbitrary radius, numerical results are presented for the triangular arrangement where the atoms are at equidistance from the sphere, and for the linear arrangement where the atoms and the sphere are aligned along a straight line. As demonstrated, the enhancement or reduction of the interaction potential in the presence of purely electric or magnetic spheres can be physically understood in terms of image charges.

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