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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Quasi-degeneracies in a 2-spin system : symmetry aspects and a perturbational approach to tunnel splitting
Authors: Schatzer, Laro
Breymann, Wolfgang
Thomas, Harry
DOI: 10.21256/zhaw-1902
Published in: Zeitschrift für Physik B: Condensed Matter
Volume(Issue): 101
Issue: 1
Page(s): 131
Pages to: 139
Issue Date: 1996
Publisher / Ed. Institution: Springer
ISSN: 0722-3277
Language: English
Subject (DDC): 530: Physics
Abstract: A large number of energy levels in different invariant subspaces of the anisotropic XY-model are quasi-degenerate in a wide parameter range, i.e., their spacing is much smaller than the mean level spacing of the system. These quasi-degeneracies can be interpreted in two ways: (i) as tunnel splitting, (ii) as weak level splitting related to a parametric point of exact degeneracy. Starting from the second interpretation we calculate the tunnel splitting by use of perturbative methods.
Further description: «Erworben im Rahmen der Schweizer Nationallizenzen (»
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Data Analysis and Process Design (IDP)
Appears in collections:Publikationen School of Engineering

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