paper

Weak Ergodicity Breaking in the Schwinger Model

arXiv:2203.08830 · doi:10.1103/PhysRevB.107.L201105

Abstract

As a paradigm of weak ergodicity breaking in disorder-free nonintegrable models, quantum many-body scars (QMBS) can offer deep insights into the thermalization dynamics of gauge theories. Having been first discovered in a spin- quantum link formulation of the Schwinger model, it is a fundamental question as to whether QMBS persist for since such theories converge to the lattice Schwinger model in the large- 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- quantum link models (QLMs) with staggered fermions. We find that QMBS persist at , with the resonant scarring regime, which occurs for a zero-mass quench, arising from simple high-energy gauge-invariant initial 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- QLMs coupled to dynamical fermions.

arXiv comment8 pages, 5 figures

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