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Title: Quasi-degeneracies in a 2-spin system : symmetry aspects and a perturbational approach to tunnel splitting
Authors : Schatzer, Laro
Breymann, Wolfgang
Thomas, Harry
Published in : The European Physical Journal B : condensed Matter and Complex Systems
Volume(Issue) : 101
Issue : 1
Pages : 131
Pages to: 139
Publisher / Ed. Institution : Springer
Issue Date: 1996
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
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 (»
Departement: School of Engineering
Organisational Unit: Institute of Data Analysis and Process Design (IDP)
Publication type: Article in scientific Journal
DOI : 10.1007/s002570050190
ISSN: 0722-3277
Appears in Collections:Publikationen School of Engineering

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