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Title

Two-level interacting boson models beyond the mean field

AuthorsArias, José María; Dukelsky, Jorge CSIC ORCID; García Ramos, José Enrique; Vidal, Julien
Keywords[PACS] Models based on group theory
[PACS] Quantum phase transitions
Issue Date2-Jan-2007
PublisherAmerican Physical Society
CitationPhysical Review C 75(1): 014301 (2007)
AbstractThe phase diagram of two-level boson Hamiltonians, including the interacting boson model (IBM), is studied beyond the standard mean field approximation using the Holstein-Primakoff mapping. The limitations of the usual intrinsic state (mean field) formalism concerning finite-size effects are pointed out. The analytic results are compared to numerics obtained from exact diagonalizations. Excitation energies and occupation numbers are studied in different model space regions (Casten triangle for IBM) and especially at the critical points.
Description10 pages, 1 table, 12 figures.-- PACS nrs.: 21.60.Fw; 73.43.Nq.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-th/0609001v1
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.75.014301
URIhttp://hdl.handle.net/10261/15410
DOI10.1103/PhysRevC.75.014301
ISSN0556-2813
E-ISSN1089-490X
Appears in Collections:(CFMAC-IEM) Artículos

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