SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Ultra-cold Plasmas and Rydberg Systems I (joint session A/Q)

Q 38.4: Talk

Wednesday, March 8, 2023, 15:15–15:30, F303

A linear response protocol to probe aging in a disordered Rydberg quantum spin system — •Moritz Hornung, Eduard Braun, Dillen Lee, Titus Franz, Sebastian Geier, Gerhard Zürn, and Matthias Weidemüller — Physikalisches Institut, Heidelberg University, Germany

In spite of many years of research, the question of whether or not the spin glass transition in disordered Heisenberg spin systems is a true phase transition is still open for debate. Of late, emerging platforms for quantum simulation greatly increase the accessibility of these systems and thus provide further insight into the topic. Already, anomalously slow dynamics that are characteristic for spin glasses have been observed on a platform consisting of Rydberg atoms, where the spin degree of freedom is encoded within highly excited electronic states.

To extend on these findings, we propose an experimental sequence based on slow ramps of the external field. This allows for the initialization of low energy states, which correspond to the low effective temperatures needed in order to observe a spin glass transition. We then introduce a small perturbation of the external field to measure the linear response depending on the speed of the initialization ramp. Finally, the platform is used to probe whether aging, rejuvenation and memory effects as observed in open spin glasses exist in a similar fashion for isolated quantum spin systems. The experimental results are complemented with numerical simulations based on exact diagonalization of a small system.