Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.80: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Disordered gases of two level Rydberg atoms — •Martin Gärttner1,2, Thomas Gasenzer2, and Jörg Evers1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg
Exciting atoms to high lying Rydberg states leads to extreme properties, most important of which are their long life-times and the long range interactions among them. For ensembles of Rydberg atoms various appications in quantum optics, quantum information and solid state physics have been proposed and implemted. We study the coherent dynamics of a finite laser-driven cloud of ultra-cold Rydberg atoms by calculating the time evolution from the full many body Hamiltonian. Using the frozen gas approximation and treating the atoms as effective two level systems, we identify effects of finite size and finite density leading to modifications of the predicted parameter scaling of the excited fraction. Also, we analyze the influence of resonant excitation channels in the case of two-photon detuned excitation lasers. We thereby study the buildup of strong correlations and crystal-like structures and discuss potential applications of these features.