ISSN:
1572-9613
Keywords:
Tunneling centers
;
glasses
;
amorphous materials
;
thermodynamic properties
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract In recent years tunneling centers have frequently been used to explain the unusual thermodynamic properties of disordered materials; in these approaches, however, the effect of the tunneling-phonon interaction is neglected. The present study considers the archetype model of phonon-assisted tunneling, which is well known from other areas of tunneling physics (quantum diffusion, etc.). It is shown that the full thermodynamic information can be rigorously extracted from a single Green function. An extended factorization procedure beyond Hartree-Fock is introduced, which is checked by sum rules as well as by exact Goldberger-Adams expansions. The phonon-modulated internal energy and specific heat are calculated for different power-law coupling setups.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01044440
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