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Quantum quench influenced by an excited-state phase transition

AuthorsPérez-Fernández, P.; Cejnar, P.; Arias, José María; Dukelsky, Jorge CSIC ORCID; García Ramos, José Enrique; Relaño, Armando
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review A, 83: 033802 (2011)
AbstractWe analyze excited-state quantum phase transitions (ESQPTs) in three schematic (integrable and nonintegrable) models describing a single-mode bosonic field coupled to a collection of atoms. It is shown that the presence of the ESQPT in these models affects the quantum relaxation processes following an abrupt quench in the control parameter. Clear-cut evidence of the ESQPT effects is presented in integrable models, while in a nonintegrable model the evidence is blurred due to chaotic behavior of the system in the region around the critical energy. © 2011 American Physical Society.
Identifiersdoi: 10.1103/PhysRevA.83.033802
issn: 1050-2947
Appears in Collections:(CFMAC-IEM) Artículos
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