Heidelberg 2015 – wissenschaftliches Programm
A 12.7: Vortrag
Dienstag, 24. März 2015, 12:30–12:45, C/kHS
Aggregation of Rydberg excitations in a dense thermal vapor cell — •Alban Urvoy1, Fabian Ripka1, Igor Lesanovsky2, Tilman Pfau1, and Robert Löw1 — 15. Physikalisches Institut , Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart Germany — 2School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK
Rydberg atoms in dense gases are of growing interest, due to the rich many-body physics enabled by the strong interactions. In particular, the effect of Rydberg aggregation, which relies on off-resonant excitation to spatially correlated ensembles of atoms, is currently studied [1,2] as it exhibits interesting correlations, as e.g. in soft-matter systems .
We present our experimental results on the excitation dynamics of such Rydberg aggregates in a vapor cell at room temperature . The scaling laws for the characteristic timescale of the excitation process are consistent with a model based on an effective Master equation. Moreover we show that our measurements are very sensitive to the interaction potentials. We are able to observe the influence dipole-quadrupole interactions.
We will also discuss the use of this sensitivity to probe various interactions of the Rydberg atoms.
 H. Schempp et al., PRL 112, 013002 (2014)
 N. Malossi et al., PRL 113, 023006 (2014)
 I. Lesanovsky and J.P. Garrahan, PRA 90, 011603(R) (2014)
 A. Urvoy et al., arXiv:1408.0039 [physics.atom-ph] (2014)