Quantum many-body scars and weak breaking of ergodicity Serbyn, Maksym ; https://orcid.org/0000-0002-2399-5827 Abanin, Dmitry A. Papić, Zlatko ddc:539 Thermalization is the inevitable fate of many complex quantum systems, whose dynamics allow them to fully explore the vast configuration space regardless of the initial state---the behaviour known as quantum ergodicity. In a quest for experimental realizations of coherent long-time dynamics, efforts have focused on ergodicity-breaking mechanisms, such as integrability and localization. The recent discovery of persistent revivals in quantum simulators based on Rydberg atoms have pointed to the existence of a new type of behaviour where the system rapidly relaxes for most initial conditions, while certain initial states give rise to non-ergodic dynamics. This collective effect has been named ”quantum many-body scarring’by analogy with a related form of weak ergodicity breaking that occurs for a single particle inside a stadium billiard potential. In this Review, we provide a pedagogical introduction to quantum many-body scars and highlight the emerging connections with the semiclassical quantization of many-body systems. We discuss the relation between scars and more general routes towards weak violations of ergodicity due to embedded algebras and non-thermal eigenstates, and highlight possible applications of scars in quantum technology. Nature Research 2021 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_dcae04bc https://research-explorer.ista.ac.at/record/9428 https://research-explorer.ista.ac.at/download/9428/10026 Serbyn M, Abanin DA, Papić Z. Quantum many-body scars and weak breaking of ergodicity. <i>Nature Physics</i>. 2021;17(6):675–685. doi:<a href="https://doi.org/10.1038/s41567-021-01230-2">10.1038/s41567-021-01230-2</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1038/s41567-021-01230-2 info:eu-repo/semantics/altIdentifier/e-issn/1745-2481 info:eu-repo/semantics/altIdentifier/wos/000655563800002 info:eu-repo/semantics/altIdentifier/arxiv/2011.09486 info:eu-repo/semantics/openAccess