Geoffrey Ji has been awarded a scholarship by the Barry M. Goldwater Scholarship and Excellence in Education Foundation, which encourages students to pursue advanced study and careers in the sciences, engineering and mathematics. He is among the 283 students selected from 1,166 students nominated nationally this year. Ji—who is majoring in physics, mathematics, economics and computer science—has been conducting quantum science research for two years in the laboratory of Chris Monroe, Bice Zorn Professor of Physics.
“Geoffrey has almost single-handedly outfitted advanced digital and analog electronic control circuits, in addition to writing impressive computer code that will soon be adopted by most of our other projects,” said Monroe.
Ji also conducted theoretical nuclear physics research with Paulo Bedaque, associate professor of physics, which resulted in co-authorship of a peer-reviewed publication in the journal Physical Review D. He is a member of the UMD Honors College and plans to pursue a doctoral degree.
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Draining the water from a bathtub causes a spinning tornado to appear. The downward flow of water into the drain causes the water to rotate, and as the rotation speeds up, a vortex forms that obeys the laws of classical mechanics. However, if the water is extremely cold liquid helium, the fluid will swirl around an invisible line to form a vortex that obeys the laws of quantum mechanics. Sometimes, two of these quantum tornadoes flex into curved lines, cross over one another to form a letter X shape, swap ends, and then violently retract from one another—a process called reconnection.
Now, for the first time, researchers provide visual evidence confirming that the reconnection of quantum vortexes launches Kelvin waves. The study, which was conducted at the University of Maryland, will be published in the journal Proceedings of the National Academy of Sciences.
In a recent experiment, published in Physical Review X, Howard Milchberg and his colleagues in the intense laser-matter interactions group demonstrate that femtosecond filaments can set up an extended and robust thermal waveguide structure in air with a lifetime of several milliseconds, making possible the very-long-range guiding and distant projection of high-energy laser pulses and high-average power beams. This is the subject of articles that appear in the latest issues of APS Viewpoint, Physics Today and Science News.