Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany.
Phys Rev Lett. 2010 Jan 8;104(1):013001. doi: 10.1103/PhysRevLett.104.013001.
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.
我们展示了 Ates 等人最近提出的超冷里德堡气体中反阻塞的实验观察结果。[Phys. Rev. Lett. 98, 023002 (2007)]。我们的方法允许控制气体中的对分布，并且基于在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。当耦合能量与里德堡长程相互作用的相互作用能量匹配时，否则被阻塞的近对激发成为可能。彭宁电离信号的时间分辨光谱测量用于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察结果，并允许我们推断最近邻距离的分布。
