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Evidence of antiblockade in an ultracold Rydberg gas

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-le...

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Main Authors: Amthor, Thomas (Author) , Giese, Christian (Author) , Hofmann, Christoph S. (Author) , Weidemüller, Matthias (Author)
Format: Article (Journal)
Language:English
Published: 8 January 2010
In: Physical review letters
Year: 2010, Volume: 104, Pages: 1-4
ISSN:1079-7114
DOI:10.1103/PhysRevLett.104.013001
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.104.013001
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.104.013001
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Author Notes:Thomas Amthor, Christian Giese, Christoph S. Hofmann, and Matthias Weidemüller

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520 |a 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. 
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