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Quantum quench influenced by an excited-state phase transition

 

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Opened Access Quantum quench influenced by an excited-state phase transition
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Author: Pérez-Fernández, Pedro
Cejnar, P.
Arias Carrasco, José Miguel
Dukelsky, Jorge
García Ramos, José Enrique
Relaño, Armando
Department: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Universidad de Sevilla. Departamento de Física Aplicada III
Date: 2011
Published in: Physical Review A, 8, 033802-1-033802-14.
Document type: Article
Abstract: 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.
Cite: Pérez-Fernández, P., Cejnar, P., Arias Carrasco, J.M., Dukelsky Bercovich, J., García Ramos, J.E. y Relaño, A. (2011). Quantum quench influenced by an excited-state phase transition. Physical Review A, 8, 033802-1-033802-14.
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URI: http://hdl.handle.net/11441/66572

DOI: 10.1103/PhysRevA.83.033802

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