Quantum Many-Body Scars: A Quasiparticle Perspective

• URL: http://arxiv.org/abs/2206.11528v2
• Date: Tue, 5 Jul 2022 11:32:43 GMT
• Title: Quantum Many-Body Scars: A Quasiparticle Perspective
• Authors: Anushya Chandran, Thomas Iadecola, Vedika Khemani, Roderich Moessner
• Abstract summary: We discuss the phenomenon of quantum many-body scars, which can give rise to certain species of stable quasiparticles throughout the energy spectrum. This goes along with a set of unusual non-equilibrium phenomena including many-body revivals and non-thermal stationary states.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Weakly interacting quasiparticles play a central role in the low-energy description of many phases of quantum matter. At higher energies, however, quasiparticles cease to be well-defined in generic many-body systems due to a proliferation of decay channels. In this review, we discuss the phenomenon of quantum many-body scars, which can give rise to certain species of stable quasiparticles throughout the energy spectrum. This goes along with a set of unusual non-equilibrium phenomena including many-body revivals and non-thermal stationary states. We provide a pedagogical exposition of this physics via a simple yet comprehensive example, that of a spin-1 XY model. We place our discussion in the broader context of symmetry-based constructions of many-body scar states, projector embeddings, and Hilbert space fragmentation. We conclude with a summary of experimental progress and theoretical puzzles.

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