Mainz 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 25: Ultracold Plasmas and Rydberg Systems (with Q)

A 25.1: 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.