Artículo
Sensitivity to perturbations and quantum phase transition
Fecha de publicación:
17/05/2013
Editorial:
Amer Physical Soc
Revista:
Physical Review E
ISSN:
1539-3755
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The local density of states or its Fourier transform, usually called fidelity amplitude, are important measures of quantum irreversibility due to imperfect evolution. In this Rapid Communication we study both quantities in a paradigmatic many body system, the Dicke Hamiltonian, where a single-mode bosonic field interacts with an ensemble of N two-level atoms. This model exhibits a quantum phase transition in the thermodynamic limit, while for finite instances the system undergoes a transition from quasi-integrability to quantum chaotic. We show that the width of the local density of states clearly points out the imprints of the transition from integrability to chaos but no trace remains of the quantum phase transition. The connection with the decay of the fidelity amplitude is also established.
Palabras clave:
Quantum Phase Transitions
,
Quantum Chaos
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Articulos(OCA CIUDAD UNIVERSITARIA)
Articulos de OFICINA DE COORDINACION ADMINISTRATIVA CIUDAD UNIVERSITARIA
Articulos de OFICINA DE COORDINACION ADMINISTRATIVA CIUDAD UNIVERSITARIA
Citación
Wisniacki, Diego Ariel; Roncaglia, Augusto Jose; Sensitivity to perturbations and quantum phase transition; Amer Physical Soc; Physical Review E; 87; 5; 17-5-2013; 050902(4);
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