Orthogonal Quantum Many-body Scars

• URL: http://arxiv.org/abs/2102.07672v3
• Date: Fri, 8 Oct 2021 13:56:20 GMT
• Title: Orthogonal Quantum Many-body Scars
• Authors: Hongzheng Zhao, Adam Smith, Florian Mintert, and Johannes Knolle
• Abstract summary: Quantum many-body scars have been put forward as counterexamples to the Eigenstate Thermalization Hypothesis. Our example provides new insights into the link between quantum ergodicity and many-body entanglement.
• Score: 0.41998444721319206
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: 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.

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