Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...237..618j&link_type=abstract
Science (ISSN 0036-8075), vol. 237, Aug. 7, 1987, p. 618-625.
Physics
64
Amorphous Materials, Hole Burning, Low Temperature Physics, Optical Emission Spectroscopy, Relaxation (Mechanics), Absorption Spectra, Normal Density Functions, Temperature Dependence, Time Dependence
Scientific paper
The magnitude and temperature dependence of most of the properties of amorphous solids are anomalous at very low temperatures (less than about 1 Kelvin). Phonon-assisted tunneling of a distribution of glassy bistable configurations, or two-level systems, can account for these anomalies. A unified understanding of the low-temperature properties is required for an understanding of the glassy state. Persistent nonphotochemical hole burning of impurity optical transitions allows a glass state to be produced that is thermally inaccessible to the preburn state, and that allows the probing of tunneling dynamics on time scales that range between picoseconds and days. These data combined with recently obtained distribution functions for the two-level systems offer new insights into the tunneling dynamics.
Jankowiak R.
Small G. J.
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