Search for tunnelling centres in Lennard-Jones clusters
arXiv:cond-mat/9710057
Abstract
We report on numerical procedures for, and preliminary results on the search for, tunnelling centres in Lennard-Jones clusters, seen as simple model systems of glasses. Several of the double-well potentials identified are good candidates to give rise to two-level systems. The role of boundary effects, and the application of the semiclassical WKB approximation in multidimensional spaces for the calculation of the ground state splitting are discussed.
7 pages, Revtex, 5 ps figures, to be published in Philosophical Magazine, January 1998, Proceedings of he 6th International Workshop on Disordred Systems, Andalo, Trento, March 1997