SKM 2021 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 7: Focus Session: Facets of Many-Body Quantum Chaos (organised by Markus Heyl and Klaus Richter) (joint session DY/TT)

DY 7.8: Talk

Wednesday, September 29, 2021, 12:00–12:15, H6

Orthogonal quantum many-body scars — •Hongzheng Zhao¹, Adam Smith Smith², Florian Mintert¹, and Johannes Knolle^1,3,4 — ¹Blackett Laboratory, Imperial College London, London, United Kingdom — ²School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, United Kingdom — ³Department of Physics TQM, Technical University of Munich, Munich, Germany — ⁴Munich Center for Quantum Science and Technology, Munich, Germany

Quantum many-body scars have been put forward as counterexamples to the Eigenstate Thermalization Hypothesis. These atypical states are observed in a range of correlated models as long-lived oscillations of local observables in quench experiments starting from selected initial states. The long-time memory is a manifestation of quantum non-ergodicity generally linked to a sub-extensive generation of entanglement entropy, the latter of which is widely used as a diagnostic for identifying quantum many-body scars numerically as low entanglement outliers. Here we show that, by adding kinetic constraints to a fractionalized orthogonal metal, we can construct a minimal model with orthogonal quantum many-body scars leading to persistent oscillations with infinite lifetime coexisting with rapid volume-law entanglement generation. Our example provides new insights into the link between quantum ergodicity and many-body entanglement while opening new avenues for exotic non-equilibrium dynamics in strongly correlated multi-component quantum systems. Reference: https://arxiv.org/abs/2102.07672