Pérez Fernández, PedroCejnar, P.Arias Carrasco, José MiguelDukelsky, J.García Ramos, José EnriqueRelaño Pérez, Armando2012-03-152012-03-152011-03-03Pérez Fernández, P., Cejnar, P., Arias Carrasco, J.M., Dukelsky, J., García Ramos, J.E.: "Quantum quench influenced by an excited-state phase transition". Physical Review A. Vol. 83, n. 3, (2011). DOI: 10.1103/PhysRevA.83.0338021050-2947http://hdl.handle.net/10272/5531We 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 the nonintegrable model the evidence is blurred due to chaotic behavior of the system in the region around the critical energy.engAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Quantum phase transitionsQuantum quenchjournal article10.1103/PhysRevA.83.033802open access