Quasi-degeneracies in a 2-spin system: symmetry aspects and a perturbational approach to tunnel splitting View Full Text


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Article Info

DATE

1996-03-01

AUTHORS

L. Schatzer, W. Breymann, H. Thomas

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. More... »

PAGES

131-139

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002570050190

DOI

http://dx.doi.org/10.1007/s002570050190

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021488733


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