Dynamics of Tunneling Centers in Metallic Systems

Details Dynamics of Tunneling Centers in Metallic Systems Dynamics of Tunneling Centers in Metallic Systems

1994-09-23

arxiv.org/abs/cond-mat/9409105v1

Phys. Rev. B, 52 (1995) 7976

Physics

Condensed Matter

REVTeX twocolumn format, 5 pages, two PostScript figures available on request. Preprint # : imsc 94/36

Scientific paper

10.1103/PhysRevB.52.7976

Dynamics of tunneling centers (TC) in metallic systems is studied, using the technique of bosonization. The interaction of the TC with the conduction electrons of the metal involves two processes, namely, the screening of the TC by electrons, and the so-called electron assisted tunneling. The presence of the latter process leads to a different form of the renormalized tunneling frequency of the TC, and the tunneling motion is damped with a temperature dependent relaxation rate. As the temperature is lowered, the relaxation rate per temperature shows a steep rise as opposed to that in the absence of electron assisted process. It is expected that this behavior should be observed at very low temperatures in a careful experiment. The present work thus tries to go beyond the existing work on the {\it dynamics} of a two-level system in metals, by treating the electron assisted process.

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