Abstract
A microscopic model of atomic tunneling states in amorphous solids is presented. It is shown that the existence of two-level system (TLS) is closely related to the void-Like structure defects and dangling bonds in the amorphous solids. The density of TLS and the distribution function of the barrier height of asymmetric double-well potential are given. Based on the model, the theoretical investigation; on the anomaly of ultrasonic attenuation and thermal conductivity has been made, and the results agree well with experiments.
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