Rydberg excitation of cesium atoms in vapor cells at room temperature
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 examine the definition of aggregates when thermal motion is non-negligible and the influence of having predominantly motional dephasing rather than laser dephasing.
 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., PRL 114, 203002 (2015)
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