DPG Phi
Verhandlungen
Verhandlungen
DPG

Darmstadt 2008 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

A: Fachverband Atomphysik

A 19: Ultracold Rydberg gases (jointly with Q)

A 19.1: Vortrag

Donnerstag, 13. März 2008, 08:30–08:45, 2G

Rydberg excitation of a Bose-Einstein condensate — •Ulrich Raitzsch, Rolf Heidemann, Vera Bendkowsky, Björn Butscher, Robert Löw, and Tilman Pfau — 5. Physikalisches Institut, Pfaffenwaldring 57, 70569 Stuttgart, Germany

We present our latest results on Rydberg excitation of a Bose-Einstein condensate [1]. Crossing the critical temperature Tc, a signature of the phase transition to Bose condensation is observed in the fraction of excited Rydberg atoms. The main features in the experimental data were reproduced by a simulation using a superatom model. A superatom is formed by N ground state atoms in a sphere with the blockade radius rb ∝ (C6/ℏΩ)1/6 due to the van der Waals interaction [2].
The Rydberg excitation is proven to be coherent despite strong interactions with a rotary echo technique known from nuclear magnetic resonance physics [3]. The rotary echo experiment was done for various densities of ground state atoms and excitation times, giving insight into the dephasing caused by the van der Waals interaction.
References

1R. Heidemann, et al., arXiv:0710.5622 (2007)
2R. Heidemann, et al., Phys. Rev. Lett. 99(16), 163601(2007)
3U. Raitzsch, et al., arXiv:0706.3869 (2007)
100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2008 > Darmstadt