SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 18: Ultra-cold Plasmas and Rydberg Systems I (joint session A/Q)

A 18.6: Talk

Wednesday, March 8, 2023, 15:45–16:00, F303

Probing the presence of phase transitions in disordered quantum spin systems — •Eduard Jürgen Braun, Moritz Hornung, Titus Franz, Dillen Lee, Sebastian Geier, Gerhard Zürn, and Matthias Weidemüller — Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg

Closed many-body quantum systems out of equilibrium can show interesting behaviour without classical counterpart, where many-body localization and discrete time crystals are among the most prominent examples. Some theories also predict a spin-glass to paramagnet quantum phase transition within a many-body localized phase. Inspired by these predictions, in this talk we are going to present our latest results to probe a possible quantum phase transition in a disordered spin system.

To experimentally study the existence of a phase transition we will use our quantum simulation platform based on a frozen Rydberg gas in order to probe nonequilibrium properties of Heisenberg XXZ spin models. By choice of an appropriate combination of Rydberg states, different symmetry classes, like the Heisenberg XX, XXZ and Ising models can be realized. For these interacting systems, we have found glassy dynamics and a non-thermalizing regime hinting towards the presence of a localized phase.