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dc.contributor.authorWang, Qian
dc.contributor.authorPérez Bernal, Francisco
dc.identifier.citationWang, Q., & Pérez-Bernal, F. (2019). Probing an excited-state quantum phase transition in a quantum many-body system via an out-of-time-order correlator. In Physical Review A (Vol. 100, Issue 6). American Physical Society (APS).
dc.identifier.issn2469-9934 (electrónico)
dc.description.abstractOut-of-time-order correlators (OTOCs) play an increasingly important role in different fields of physics and in particular they provide a way of quantifying information scrambling in quantum many-body systems. We verify that an OTOC can be used to probe an excited-state quantum phase transition (ESQPT) in a quantum many-body system. We examine the dynamical properties of an OTOC in the Lipkin-Meshkov-Glick model, which undergoes an ESQPT, using the exact diagonalization method. We show that the long-time evolution of the proposed OTOC is remarkably different in the different phases of the ESQPT. In consequence, we put the long-time averaged value of the OTOC forward as a possible ESQPT order parameter. Our results highlight the connections between OTOCs and ESQPTs, opening the possibility of using OTOCs for accessing experimentally ESQPTs in quantum many-body systems.es_ES
dc.publisherAmerican Physical Societyes_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherQuantum phase transitionses_ES
dc.subject.otherQuantum many body systemes_ES
dc.titleProbing excited-state quantum phase transition in a quantum many body system via out-of-time-ordered correlatores_ES

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