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Journal Article

Quantum Many-Body Scars: A Quasiparticle Perspective

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Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Chandran, A., Iadecola, T., Khemani, V., & Moessner, R. (2023). Quantum Many-Body Scars: A Quasiparticle Perspective. Annual Review of Condensed Matter Physics, 14, 443-469. doi:10.1146/annurev-conmatphys-031620-101617.


Cite as: https://hdl.handle.net/21.11116/0000-000D-2AC7-4
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 owing 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 nonequilibrium phenomena including many-body revivals and nonthermal 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.