Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 12: Ultra-cold atoms, ions and BEC (with A)

Q 12.6: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Controlling Rydberg atoms in dense gases — •Karl Magnus Westphal, Kathrin Sophie Kleinbach, Felix Engel, Fabian Böttcher, Michael Schlagmüller, Robert Löw, Tara Cubel Liebisch, Sebastian Hofferberth, and Tilman Pfau — 5. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

When a Rydberg atom is excited in a dense gas, there can be tens of thousands of neutral atoms within the Rydberg electron orbit, resulting in a density-dependent frequency shift, as discovered by Amaldi and Segrè in 1934. However, Rydberg excitations in a BEC lead not only to a density shift, but a line shape that changes with the principal quantum number n. The line broadening depends precisely on the interaction potential energy curves of the Rydberg electron with the neutral atom perturbers. In particular, we show the relevance of the triplet p-wave shape resonance in the e⁻-Rb(5S) scattering, which significantly modifies the interaction potential [1]. We discuss a variety of results of experiments with a single charged impurity in quantum gases as well as wavefunction imaging. Spatial control of the excitations allows us to study the density-dependent quantum chemistry between a Rydberg atom and neutral atoms.

1. M. Schlagmüller et al., arXiv:1510.07003, (2015)