Modeling a ‘‘tunneling’’ state in amorphous silicon dioxide
- 15 January 1986
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 33 (2), 1506-1508
- https://doi.org/10.1103/physrevb.33.1506
Abstract
A computer simulation of amorphous silicon dioxide has produced an example of a realistic model in which there exist two configurations of locally minimum energy differing by only 0.6× erg/atom, separated by a maximum of erg/atom. The configurations can be interconverted almost entirely by rigid rotations of about seven tetrahedra which are connected by sharing corners. The inelastic neutron scattering by the lowest vibrational modes agrees well with a recent experiment. It is suggested that the model is typical of the states responsible for the unusual properties of glasses at very low temperatures.
Keywords
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