Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Ultra-cold plasmas and Rydberg systems III (with Q)

A 20.8: Vortrag

Dienstag, 18. März 2014, 15:45–16:00, BEBEL E44/46

Physics beyond rate equation modeling and the breakdown of universality in Ryberg EIT — •Martin Gärttner and Jörg Evers — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

For the description of laser driven interacting Rydberg gases and associated nonlinear optical effects, rate equation models have been used extensively recently. We discuss why these models are capable of reproducing collective effects and how they predict a universal relation between Rydberg density and optical susceptibility. By comparing with exact numerical solutions of the many-body master equation, we find regimes in which the rate equation models and the universal relations break down. Most remarkably, for strong coherent driving, an enhancement of Rydberg excitation is found, which cannot be reproduced by rate equation models and thus is a truly coherent effect.