%0 Journal Article
%A Pérez Fernández, P.
%A Cejnar, P.
%A Arias, J. M.
%A Dukelsky, J.
%A García Ramos, J. E.
%A Relaño Pérez, Armando
%T Quantum quench influenced by an excited-state phase transition
%D 2011
%@ 1050-2947
%U https://hdl.handle.net/20.500.14352/44413
%X 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.
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