Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 37: Ultracold Plasmas and Rydberg Systems
Q 37.1: Gruppenbericht
Mittwoch, 8. März 2017, 14:30–15:00, P 104
Non-equilibrium dynamics of dipolar interacting Rydberg spins — •Adrien Signoles1, Miguel Ferreira-Cao1, Asier Pineiro Orioli2, Renato Ferracini Alves1, Vladislav Gavryusev1, Gerhard Zürn1, Jürgen Berges2, Shannon Whitlock1, and Matthias Weidemüller1 — 1Physikalisches Institut, Universität Heidelberg, Germany — 2Institut für Theoretische Physik, Universität Heidelberg, Germany
Rydberg atoms in ultracold gases constitute controllable systems to experimentally study non-equilibrium phenomena, like thermalization of isolated quantum systems or relaxation after quenches. Of specific interest is the possibility to introduce resonant dipolar exchange interactions, providing new opportunities for investigating the dynamics of strongly correlated many-body quantum systems with beyond nearest-neighbour coupling.
We present an experimental realization of a prototypical dipolar spin model by coupling two strongly interacting Rydberg states by a microwave field. At low Rydberg density where interactions are negligible, we show that our system can be mapped into a spin-1/2 model, in which full control and readout are achieved by using arbitrary single-spin rotations. By driving the system out-of-equilibrium for higher densities we report the observation of coherent spin oscillations with interaction-induced damping, which can be described in terms of a dipolar XX-model in effective magnetic fields. The comparison with theoretical calculations allows us to identify the primordial quantum fluctuations as a source of relaxation.