The Michigan Engineer News Center

Professor Gray discusses lessons learned in GEOSTRATA

The Geo-Institute’s bi-monthly magazine, GEOSTRATA, published an article in the January/February 2016 issue that featured Emeritus Professor Donald Gray.| Short Read

The article was part of the magazine’s “Lessons Learned from GeoLegends” series. The series is an opportunity for graduate students to interview distinguished academics or practitioners in geotechnical engineering. The article was written by three students from Lehigh University.

Gray has more than 50 years of teaching and engineering experience as a leader in the analysis and design of environmentally friendly bio-stabilization techniques. The students asked how he first became interested in slope bio-stabilization. He said, “I’ve always been interested in the influence of woody vegetation on the stability of slopes and the adverse effects of its removal on slope stability.”

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The electrons absorb laser light and set up “momentum combs” (the hills) spanning the energy valleys within the material (the red line). When the electrons have an energy allowed by the quantum mechanical structure of the material—and also touch the edge of the valley—they emit light. This is why some teeth of the combs are bright and some are dark. By measuring the emitted light and precisely locating its source, the research mapped out the energy valleys in a 2D crystal of tungsten diselenide. Credit: Markus Borsch, Quantum Science Theory Lab, University of Michigan.

Mapping quantum structures with light to unlock their capabilities

Rather than installing new “2D” semiconductors in devices to see what they can do, this new method puts them through their paces with lasers and light detectors. | Medium Read