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.
- Score: 0.0
- 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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