Singer Kilian, Reetz-Lamour Markus, Amthor Thomas, Marcassa Luis Gustavo, Weidemüller Matthias
Physikalisches Institut der Universität Freiburg, Germany.
Phys Rev Lett. 2004 Oct 15;93(16):163001. doi: 10.1103/PhysRevLett.93.163001. Epub 2004 Oct 13.
We report on the observation of ultralong range interactions in a gas of cold rubidium Rydberg atoms. The van der Waals interaction between a pair of Rydberg atoms separated as far as 100,000 Bohr radii features two important effects: spectral broadening of the resonance lines and suppression of excitation with increasing density. The density dependence of these effects is investigated in detail for the S- and P-Rydberg states with principal quantum numbers n approximately 60 and n approximately 80 excited by narrow-band continuous-wave laser light. The density-dependent suppression of excitation can be interpreted as the onset of an interaction-induced local blockade.
我们报告了在冷铷里德堡原子气体中对超长程相互作用的观测结果。一对相隔达100,000玻尔半径的里德堡原子之间的范德瓦尔斯相互作用具有两个重要效应：共振线的光谱展宽以及随着密度增加激发的抑制。利用窄带连续波激光激发主量子数n约为60和n约为80的S态和P态里德堡态，详细研究了这些效应的密度依赖性。激发的密度依赖性抑制可被解释为相互作用诱导的局部阻塞的开始。
