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arXiv 0907.5405physics.atom-ph
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两组空间分离的里德伯原子间偶极-偶极相互作用的模拟

Simulations of the Dipole-Dipole Interaction between Two Spatially Separated Groups of Rydberg Atoms

T. J. Carroll, C. Daniel, L. Hoover, T. Sidie, M. W. Noel

摘要:

模拟了超冷里德伯原子间的偶极-偶极相互作用。我们研究了一个一般的相互作用方案,其中两个原子被激发到x和x'态,通过福斯特共振转换到y和y'态。原子排列在两个空间上分离的组中,每个组仅由一种原子组成。我们记录了当两个基团之间的距离变化时,被激发到y'态的原子的分数。在零失谐的情况下,依赖于总是共振的相互作用的多体效应导致相互作用具有有限的范围。当失谐量大于零时,另一个多体效应会在两组原子之间有一定距离时引起相互作用的峰值。为了得到这些结果,有必要包括多个原子和解决整个多体波函数。这些模拟结果支持最近的实验证据。这些多体效应与原子的适当空间排列相结合,可以用于控制原子之间的能量交换。

英文摘要:

The dipole-dipole interaction among ultra-cold Rydberg atoms is simulated. We examine a general interaction scheme in which two atoms excited to the x and x' states are converted to y and y' states via a Forster resonance. The atoms are arranged in two spatially separated groups, each consisting of only one species of atom. We record the fraction of atoms excited to the y' state as the distance between the two groups is varied. With zero detuning a many-body effect that relies on always resonant interactions causes the interaction to have a finite range. When the detuning is greater than zero, another many-body effect causes a peak in the interaction when the two groups of atoms are some distance away from each other. To obtain these results it is necessary to include multiple atoms and solve the full many-body wave function. These simulation results are supported by recent experimental evidence. These many-body effects, combined with appropriate spatial arrangement of the atoms, could be useful in controlling the energy exchange among the atoms.

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