2026-07-25T15:14:03Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/444132023-08-27T00:03:30Zcom_20.500.14352_14col_20.500.14352_15

Quantum quench influenced by an excited-state phase transition Pérez Fernández, P. Cejnar, P. Arias, J. M. Dukelsky, J. García Ramos, J. E. Relaño Pérez, Armando We 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. 2023-06-20T03:46:19Z 2023-06-20T03:46:19Z 2023-06-20T03:46:19Z 2011-03-03 journal article https://hdl.handle.net/20.500.14352/44413 1050-2947 10.1103/PhysRevA.83.033802 eng 202/09/0084 MSM 0021620859 FIS2009-07277 FIS2008-04189 FIS2006-12783-C03-01 FPA2006-13807-C02-02 FPA2007-63074 FIS2009-11621-C02-01 CSPD-2007-00042-Ingenio FQM160 FQM318 P05-FQM437 P07-FQM-02962 UCM-910059 open access American Physical Society