Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 11: Poster: Quantum Optics and Photonics I

Q 11.14: Poster

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

Rydberg-dressed interactions in trap loss spectroscopy of ultracold potassium — •Stephan Helmrich, Alda Arias, Nils Pehoviak, Emil Pavlov, Tobias Wintermantel, and Shannon M Whitlock — Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg

The introduction of long-range interactions between particles in ultracold atomic gases can give rise to new and exotic phases of matter. Weakly admixing a Rydberg state to ground state atoms (Rydberg dressing) presents one avenue towards realising such interactions. We aim to perform Rydberg dressing of ultracold potassium atoms, utilising a two-photon ladder-transition close to two-photon resonance. A strong cooperative enhancement in interaction strength due to multiphoton and multiatom excitations is theoretically predicted. It allows to externally control both interaction strength and dressed-state lifetime by the Rabi frequencies and the detunings of both laser fields. Furthermore, we will present spectroscopy measurements of trap loss due to interaction effects, which allow us to directly compare theoretical predictions with experimental observations. We will show first signatures of interactions induced through Rydberg dressing, which are the first step towards simulating quantum systems with strong and long-range correlations. This would enable the study of novel pairing mechanisms, supersolidity or new types of superfluidity.