Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.64: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Many-body effects in Rydberg gases — •Martin Gärttner1, Jörg Evers1, and Thomas Gasenzer2 — 1MPI für Kernphysik, Heidelberg — 2Institut für theoretische Physik, Heidelberg
The early theoretical treatmet of ensembles of Rydberg atoms fucused on mean field models, which explain the observed Rydberg blockade well, but disregard all quantum many-body features of the system. It has been shown recently [1,2,3] that these microscopic many-body features are important, especially at high atom densities.
We investigate the dynamics of cold interacting Rydberg gases taking into account the full many body Hamiltonian. For small atom numbers we perform fully coherent exact many body simulations. The parameter space is explored for certain toy models with a focus on higher order correlations. More realistic situations with larger atom numbers and decoherence effects are treated by Monte Carlo sampling. Here we make use of the assumption of the Rydberg blockade to reduce the number of basis states of our otherwise tremendously large Hilbert space.
[1] T. Pohl and P. R. Bermann, Phys. Rev. Lett. 102, 013004 (2009)
[2] B. Sun and F. Robicheaux, Phys. Rev. A 78, 040701 (2008)
[3] H. Schempp et al., Phys. Rev. Lett. 104, 173602 (2010)