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Anatomy of the fragmented Hilbert space: Eigenvalue tunneling, quantum scars, and localization in the perturbed random regular graph
Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia; Laboratory of Complex Networks, Center for Neurophysics and Neuromorphic Technologies, Moscow 119991, Russia.
Nordita SU; Institute for Physics of Microstructures, Russian Academy of Sciences, 603950 Nizhny Novgorod, GSP-105, Russia.
Laboratory of Complex Networks, Center for Neurophysics and Neuromorphic Technologies, Moscow 119991, Russia; Higher School of Economics, Moscow 123458, Russia.
Laboratory of Complex Networks, Center for Neurophysics and Neuromorphic Technologies, Moscow 119991, Russia; Institute for Information Transmission Problems, Moscow 127994, Russia.
2023 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 108, no 9, article id 094203Article in journal (Refereed) Published
Abstract [en]

We consider the properties of the random regular graph with node degree d perturbed by chemical potentials μk for a number of short k-cycles. We analyze both numerically and analytically the phase diagram of the model in the (μk,d) plane. The critical curve separating the homogeneous and clusterized phases is found and it is demonstrated that the clusterized phase itself generically is separated as the function of d into the phase with ideal clusters and phase with coupled ones when the continuous spectrum gets formed. The eigenstate spatial structure of the model is investigated and it is found that there are localized scarlike states in the delocalized part of the spectrum, that are related to the topologically equivalent nodes in the graph. We also reconsider the localization of the states in the nonperturbative band formed by eigenvalue instantons and find the semi-Poisson level spacing distribution. The Anderson transition for the case of combined (k-cycle) structural and diagonal (Anderson) disorders is investigated. It is found that the critical diagonal disorder gets reduced sharply at the clusterization phase transition but does it unevenly in nonperturbative and mid-spectrum bands, due to the scars, present in the latter. The applications of our findings to 2d quantum gravity are discussed.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2023. Vol. 108, no 9, article id 094203
National Category
Condensed Matter Physics Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-338390DOI: 10.1103/PhysRevB.108.094203ISI: 001089461200003Scopus ID: 2-s2.0-85172434035OAI: oai:DiVA.org:kth-338390DiVA, id: diva2:1806998
Note

QC 20231115

Available from: 2023-10-24 Created: 2023-10-24 Last updated: 2023-11-15Bibliographically approved

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