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Topological Quantum States of Matter is Topic for Next Science Cafe

The topological properties of cold matter is the topic for a monthly public science forum organized by the UM Department of Physics and Astronomy.

Kevin Beach

The fall semester’s second meeting of the Oxford Science Café is set for 6 p.m. Oct. 20 at Lusa Bakery Bistro and Bar, 1120 North Lamar Blvd. Kevin Beach, UM assistant professor of physics and astronomy, will discuss “Topological Quantum States of Matter.” Admission is free.

“Our usual experience is that objects become increasingly ordered as they move from hot to cold,” Beach said. “But some materials do not undergo such a transition. This is possible because the agitation that keeps them disordered is quantum rather than thermal.

“Even more strange, we understand that featureless quantum states can have a so-called topological character, which means that they behave differently when defined on the surface of a donut or a sphere.”

Beach’s 30-minute presentation will explain these concepts using only pictures and demonstrations and no equations. He will also give the example of a quantum phase of matter that is believed to exist in certain antiferromagnets, which are substances in which, at low temperatures, the magnetic moments of adjacent atoms point in opposite directions.

“Heat energy works to agitate and disrupt,” he said. “When that energy is taken away, materials typically settle into a preferred configuration that exhibits pattern and regularity rather than randomness and disorder. But some materials, even at their lowest achievable temperature, remain totally featureless, like a liquid. This may be a key feature for the development of quantum computers. “

Beach earned his doctorate at the Massachusetts Institute of Technology, and bachelor’s and master’s degrees from Queen’s University in Kingston, Ontario. A former fellow of the Alexander von Humboldt Foundation, he previously held an academic appointment at the University of Alberta.

His research areas are condensed matter physics and computational physics.

For more information about Oxford Science Café programs, go tohttp://www.phy.olemiss.edu/oxfordsciencecafe. For more information about the Department of Physics and Astronomy, visit http://www.olemiss.edu/depts/physics_and_astronomy or call 662-915-5311.

Courtesy UM Communications

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