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dc.contributor.authorWang, Qian
dc.contributor.authorPérez Bernal, Francisco
dc.identifier.citationWang, Q., & Pérez-Bernal, F. (2021). Signatures of excited-state quantum phase transitions in quantum many-body systems: Phase space analysis. In Physical Review E (Vol. 104, Issue 3). American Physical Society (APS).
dc.identifier.issn2470-0053 (electrónico)
dc.description.abstractUsing the Husimi quasiprobability distribution, we investigate the phase space signatures of excited-state quantum phase transitions (ESQPTs) in the Lipkin-Meshkov-Glick and coupled top models. We show that the ESQPT is evinced by the dynamics of the Husimi function, that exhibits a distinct time dependence in the different ESQPT phases. We also discuss how to identify the ESQPT signatures from the long-time averaged Husimi function and its associated marginal distributions. Moreover, from the calculated second moment and Wherl entropy of the long-time averaged Husimi function, we estimate the critical points of the ESQPT in both models, obtaining a good agreement with analytical (mean field) results. We provide a firm evidence that phase space methods are both a new probe for the detection and a valuable tool for the study of ESQPTs.es_ES
dc.publisherAmerican Physical Societyes_ES
dc.relation.isversionofPublisher’s version
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.titleSignatures of excited-state quantum phase transitions in quantum many-body systems: Phase space analysises_ES
dc.subject.unesco22 Físicaes_ES

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