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Excited-state quantum phase transitions in a two-fluid Lipkin model

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Autor: García Ramos, José Enrique
Pérez Fernández, P.
Arias Carrasco, José Miguel
Departamento: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Fecha: 2017-05-30
Publicado en: Physical Review C - Nuclear Physics, 95 (5), 054326-1-054326-15.
Tipo de documento: Artículo
Resumen: Background: Composed systems have become of great interest in the framework of ground-state quantum phase transitions (QPTs) and many of their properties have been studied in detail. However, in these systems, the study of the so-called excited-state quantum phase transitions (ESQPTs) has not received so much attention. Purpose: A quantum analysis of the ESQPTs in the two-fluid Lipkin model is presented in this work. The study is performed through the Hamiltonian diagonalization for selected values of the control parameters in order to cover the most interesting regions of the system phase diagram. Method: A Hamiltonian that resembles the consistent-Q Hamiltonian of the interacting boson model (IBM) is diagonalized for selected values of the parameters. Properties such as the density of states, the Peres lattices, the nearest-neighbor spacing distribution, and the participation ratio are analyzed. Results: An overview of the spectrum of the two-fluid Lipkin model for selected position...
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Cita: García Ramos, J.E., Pérez Fernández, P. y Arias Carrasco, J.M. (2017). Excited-state quantum phase transitions in a two-fluid Lipkin model. Physical Review C - Nuclear Physics, 95 (5), 054326-1-054326-15.
Tamaño: 4.909Mb
Formato: PDF

URI: http://hdl.handle.net/11441/64263

DOI: 10.1103/PhysRevC.95.054326

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