Following a year as a research associate at IBM Watson Laboratories and a teacher at CCNY in the evening, she became a Member of the Technical Staff at Bell Telephone Laboratories at Murray Hill, New Jersey. In September 1964 she was appointed assistant professor at the CCNY. She was promoted to associate professor in 1967, to the rank of professor in 1971, and Distinguished Professor in 1995. She served as the Executive Officer of the University wide CUNY Ph. D. Program in Physics from 1975 to 1978.
Novel Behavior of Two Dimensional Electron Systems
One of the most interesting current questions in condensed matter physics is whether the unusual behavior observed in dilute, strongly-interacting two dimensional systems of electrons (or holes) signals the presence of a metallic phase and a metal-insulator transition.
According to well established theory, two-dimensional systems of weakly interacting electrons (or holes) are expected to be insulating in zero magnetic field B=0 in the zero-temperature limit. Experiments performed in the early 1980's provided confirmation of these expectations for relatively high electron densities. The availability within the last decade of samples of unusually high mobilities have allowed access to much lower electron (hole) densities, where electron interactions are quite strong. Unexpected metallic behavior has been observed in this low-density regime: for electron densities above some critical (low) density the resistivity decreases with decreasing temperature down to the lowest accessible temperatures while exhibiting insulating behavior at lower densities. This suggests there exists a true metallic phase in 2D.
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