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TT: Fachverband Tiefe Temperaturen
TT 19: Many-body Quantum Dynamics I (joint session DY/TT)
TT 19.3: Vortrag
Dienstag, 18. März 2025, 10:00–10:15, H37
Quantum many-body scars beyond the PXP model in Rydberg simulators — Aron Kerschbaumer1, Marko Ljubotina1,2,3, Maksym Serbyn1, and •Jean-Yves Desaules1 — 1Institute of Science and Technology Austria, Klosterneuburg, Austria — 2Technical University of Munich, Garching, Germany — 3Munich Center for Quantum Science and Technology, Munich, Germany
Persistent revivals recently observed in Rydberg atom simulators have challenged our understanding of thermalization and attracted much interest to the concept of quantum many-body scars (QMBSs). QMBSs are non-thermal highly excited eigenstates that coexist with typical eigenstates in the spectrum of many-body Hamiltonians, and have since been reported in multiple theoretical models, including the so-called PXP model, approximately realized by Rydberg simulators. At the same time, questions of how common QMBSs are and in what models they are physically realized remain open.
In our work, we demonstrate that QMBSs exist in a broader family of models that includes and generalizes PXP to longer-range constraints and states with different periodicity. We show that in each model, multiple QMBS families can be found. Each of them relies on a different approximate su(2) algebra, leading to oscillatory dynamics in all cases. However, in contrast to the PXP model, their observation requires launching dynamics from weakly entangled initial states rather than from a product state. The new QMBSs we unveil may be experimentally probed using Rydberg atom simulator in the regime of longer-range Rydberg blockades.
Keywords: Quantum many-body scars; Ergodicity breaking; Rydberg atoms; Out-of-equilibrium dynamics