Quantum 1/f noise in high technology applications including ultrasmall structures and devices

This report summarizes progress achieved this year both in the more general formulation of our new criterion for nonlinear systems which allows us to tell right away if a chaotic system will exhibit a l/f spectrum, and in the application and further study of the quantum l/f effect. The general criterion was applied to a one-dimensional crystal with anharmonic interactions, predicting for the first time a l/f phonon number spectrum in the chaotic regime at very low frequencies and always when cubic terms are dominant in the potential energy. The quantum l/f theory was applied to a quartz resonator directly for the first time, providing both an explanation for the observed l/f frequency fluctuations and optimization means. Our new formula for collector l/f noise in ultrasmall BJT's was found to agree reasonably with the experiment.