Pérez Fernández, PedroRelaño Pérez, ArmandoCejnar, P.Arias Carrasco, José MiguelDukelsky, J.García Ramos, José Enrique2013-02-222013-02-222012Pérez Fernández, P., Relaño Pérez, A., Cejnar, P., Arias Carrasco, J.M., Dukelsky, J., García Ramos, J.E.: "Excited state quantum phase transitions and chaos in the Dicke model". AIP Conference Proceedings. Vol. 1488, 318 (2012)0094-243X1551-7616 (electrónico)http://hdl.handle.net/10272/6375Comunicación presentada a: Meeting on Beauty in Physics - Theory and Experiment in Honor of Francesco Lachello on the Occasion of his 70th Birthday Location: México, may 14-18, 2012In this contribution, the critical behavior of excited state quantum phase transitions (ESQPT’s) and its relation to order and chaos in the Dicke model are studied. This model is nonintegrable. For comparison, the same problem is studied for the Jaynes-Cummings model which is, somehow, the integrable version of the Dicke model. The existence of an ESQPT is confirmed in both cases. However, in the Dicke model the signatures of criticality in excited states are blurred by the onset of quantum chaos. It is concluded that the emergence of quantum chaos is caused by the precursors of the excited state quantum phase transition.engAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Quantum chaosExcited state quantum phase ransitionconference output10.1063/1.4759413open access