| Numéro |
J. Phys. Colloques
Volume 42, Numéro C4, Octobre 1981
Proceedings of the Ninth International Conference on Amorphous and Liquid Semiconductors
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|---|---|---|
| Page(s) | C4-1073 - C4-1076 | |
| DOI | https://doi.org/10.1051/jphyscol:19814235 | |
J. Phys. Colloques 42 (1981) C4-1073-C4-1076
DOI: 10.1051/jphyscol:19814235
ON THE RELAXATION TIME OF CERTAIN TWO-LEVEL SYSTEMS I N AMORPHOUS STRUCTURES
L. Ferrari1 and G. Russo21 Istituto di Matematica dell 'Università - Ferrara, Italy Gruppo Nazionale di Struttura della Materia - Unità di Bologna - Bologna, Italy
2 Istituto di Fisica dell 'Università - Bologna, Italy Gruppo Nazionale di Struttura della Materia - Unità di Bologna - Bologna, Italy
Abstract
The origin and dynamics of 2-level systems in amorphous structures have been recently interpreted by the authors in terms of D+ D - intimate pairs interactions. Since the "tunnelling" particles are electrons (and not atoms) and the quantum picture of the model is quite different from that first introduced by Anderson et Al. in 1972, the problem concerned with the relaxation time τ of 2-level systems has been reviewed and τ re-calculated. At given temperature, τ is shown to be much shorter than predicted by previous theories. It is suggested that the corresponding 2-level systems represent the "anomalous" (or fast) ones introduced by Black and Halperin for interpretating some time-dependent experimental data obtained at low temperature.