Evidence of Antiblockade in an Ultracold Rydberg Gas
Evidence of Antiblockade in an Ultracold Rydberg Gas
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DOI：
10.1103/physrevlett.104.013001
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发表时间：
2010-01-08
影响因子：
8.6
通讯作者：
Weidemueller, Matthias
中科院分区：
文献类型：
--
作者：
Amthor, Thomas;Giese, Christian;Weidemueller, Matthias
我们介绍了最近由Ates等人提出的在超冷Rydberg气体中反封锁的实验观察。[物理。莱特牧师。98、023002(2007年)]。我们的方法允许控制气体中的对分布，并且基于原子三能级系统中一个跃迁的强耦合，同时引入另一个跃迁的特定失谐。当耦合能与里德堡长程相互作用的相互作用能相匹配时，近距离相互作用对的激发被阻挡成为可能。潘宁电离信号的时间分辨光谱测量被用来识别原子随机排列的里德堡对分布的微小变化。提出了一个基于对相互作用哈密顿量的模型，该模型很好地再现了我们的实验观测结果，并允许人们推导出最近邻距离的分布。
We present the experimental observation of the antiblockade in an ultracold Rydberg gas recently proposed by Ates et al. [Phys. Rev. Lett. 98, 023002 (2007)]. Our approach allows the control of the pair distribution in the gas and is based on a strong coupling of one transition in an atomic three-level system, while introducing specific detunings of the other transition. When the coupling energy matches the interaction energy of the Rydberg long-range interactions, the otherwise blocked excitation of close pairs becomes possible. A time-resolved spectroscopic measurement of the Penning ionization signal is used to identify slight variations in the Rydberg pair distribution of a random arrangement of atoms. A model based on a pair interaction Hamiltonian is presented which well reproduces our experimental observations and allows one to deduce the distribution of nearest-neighbor distances.