Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 28: Poster: Ultra-cold plasmas and Rydberg systems (with Q)

A 28.2: Poster

Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais

Aggregate formation in off-resonantly driven Rydberg gases — •Martin Gärttner, David Schönleber, and Jörg Evers — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The dynamics of a cloud of ultra-cold two-level atoms is studied at off-resonant laser driving to a Rydberg state. We find that resonant excitation channels lead to strongly peaked spatial correlations associated with the buildup of asymmetric excitation structures. These aggregates can extend over the entire ensemble volume, but are in general not localized relative to the system boundaries. We identify characteristic features in the spatial excitation density, the Mandel Q parameter, higher statistical moments, and the total number of excitations. Moreover, the influence of decoherence on the aggregate formation mechanism is studied. We conclude that in the presence of strong decoherence the aggregates grow sequentially around an initial grain. In the strongly dissipative regime a rate-equation description can be employed. This allows us to study large ensembles of atoms and to directly compare our findings to recent experimental observations [1].
Schempp et al., arXiv:1308.0264 (2013)