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arXiv 0906.2272quant-ph
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平面腔中基态极性分子热Casimir-Polder势的增强

Enhancement of thermal Casimir-Polder potentials of ground-state polar molecules in a planar cavity

Simen A. Ellingsen, Stefan Yoshi Buhmann, Stefan Scheel

备注：
12 pages, 10 figures, minor corrections
发表信息：
Physical Review A 80 (2), 022901 (2009)
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摘要：

我们分析了一个基态分子在平面腔中所经历的热Casimir-Polder势，并研究了使用这样一种装置进行分子引导的前景。与这种非平衡状态相关的共振原子-场相互作用表现为电势的振荡驻波分量。虽然相应的势阱通常太浅而不能使用，但是它们可以被高度反射的腔放大，该腔的宽度等于特定分子跃迁频率的半整数倍。我们发现，通过理想的分子选择和超高反射率布拉格镜腔的使用，有可能将电势提高两个数量级。我们解析地推导出作为反射率的函数的潜在深度的缩放，并分析它如何随温度和分子性质而变化。它还示出了如何潜在的深度减少的驻波与大量的节点。最后，我们研究了分子基态在热环境中的寿命，发现它不受腔的影响很大，保持在几秒的数量级。

英文摘要：

We analyze the thermal Casimir-Polder potential experienced by a ground-state molecule in a planar cavity and investigate the prospects for using such a set-up for molecular guiding. The resonant atom-field interaction associated with this non-equilibrium situation manifests itself in oscillating, standing-wave components of the potential. While the respective potential wells are normally too shallow to be useful, they may be amplified by a highly reflecting cavity whose width equals a half-integer multiple of a particular molecular transition frequency. We find that with an ideal choice of molecule and the use of ultra-high reflectivity Bragg mirror cavity, it may be possible to boost the potential by up to two orders of magnitude. We analytically derive the scaling of the potential depth as a function of reflectivity and analyze how it varies with temperature and molecular properties. It is also shown how the potential depth decreases for standing waves with a larger number of nodes. Finally, we investigate the lifetime of the molecular ground state in a thermal environment and find that it is not greatly influenced by the cavity and remains in the order of several seconds.

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