Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 40: Poster: Ultra-cold plasmas and Rydberg systems (with Q)

A 40.8: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Rydberg Dressing in the Super Atom Picture — •Alexander Krupp, Jonathan Balewski, Anita Gaj, Sebastian Hofferberth, Robert Löw, and Tilman Pfau — 5. Physikalisches Institut, Universität Stuttgart, Germany

Highly excited Rydberg atoms show strong interaction over a mesoscopic range, which can be controlled using external electric and magnetic fields [1]. Such an interaction can block the excitation in the range of the blockade radius around the Rydberg atom. In case of coherently driven samples one can think about one excitation shared by all the atoms within a sphere. These N atoms then effectively behave like one atom driven with a √N enhanced collective Rabi frequency, therefore forming a so called superatom. By exciting a sample of atoms at large detunings from the Rydberg state one can generate a coherent collective state with long lifetime [2], which would allow to observe mechanical effects of the Rydberg-Rydberg interaction potential on the whole sample. By tuning the excitation laser parameters and external fields one can therefore tailor the atomic interaction potential. This ability permits one to achieve interesting and novel many-body phases ranging from superfluid to supersolid crystals. We show that the interaction potential of weakly Rydberg dressed atoms can be understood within the super atom picture. This description allows us to calculate the effect on a BEC under realistic experimental conditions.
J. Nipper et al., Phys. Rev. X 2, 031011 (2012)
J. Honer et al., Phys. Rev. Lett. 105, 160404 (2010)