Weak ergodicity breaking in the Schwinger model

Abstract

As a paradigm of weak ergodicity breaking in disorder-free non integrable models, quantum many-body scars(QMBS) can offer deep insights into the thermalization dynamics of gauge theories. Having been first discovered in a spin- 12 quantum link formulation of the Schwinger model, it is a fundamental question as to whether QMBS persist for S > 12 since such theories converge to the lattice Schwinger model in the large-S limit, which is the appropriate version of lattice QED in one spatial dimension. In this work, we address this question by exploring QMBS in spin-S U(1) quantum link models (QLMs) with staggered fermions. We find that QMBS persist atS > 12 , with the resonant scarring regime, which occurs for a zero-mass quench, arising from simple high-energy gauge-invariant initial product states. We furthermore find evidence of detuned scarring regimes, which occur for finite-mass quenches starting in the physical vacua and the charge-proliferated state. Our results conclusively show that QMBS exist in a wide class of lattice gauge theories in one spatial dimension represented by spin-SQLMs coupled to dynamical fermions, and our findings can be tested on near-term cold-atom quantum simulators of these models

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ORCID for Debasish Banerjee: orcid.org/0000-0003-0244-4337

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