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This Week at Physics

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Events on Thursday, February 7th, 2013

R. G. Herb Condensed Matter Seminar
Topological Phases in Transition Metal Oxides
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Gregory A. Fiete, University of Texas at Austin
Abstract: Topological phases of matter have received intense interest over the past few years due to the experimental discovery of time-reversal invariant topological insulators (TI) in two and three dimensions. To date, the materials where TI have been reported are weakly interacting and most (if not all) have been previously predicted with simple band theory or density functional theory. The fate of TI in the presence of interactions remains an open area of theoretical and experimental study. In this talk, I will describe some of our theoretical efforts directed at the discovery and understanding of interacting topological phases in real materials. Some of the most promising platforms for experimental realization of these phases are transition metal oxides and heterostructures derived from them.
Host: Perkins
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Astronomy Colloquium
Galactic Winds: Lessons from Nearby Starbursts
Time: 3:30 pm
Place: 4421 Sterling Hall
Speaker: Jay Gallagher, UW Astronomy Prof and Chair
Abstract: Gas outflows from galaxies are a key aspect of the feedback process. Winds act as a cosmic safety valve to limit star formation while also injecting metals, magnetic fields, and cosmic rays along with fast moving gas into their surroundings. They also may provide a path for the escape of Lyman continuum photons through the hot, highly ionized wind material. Studies of 3 nearby classic starburst galaxies with winds, M82, NGC 253, and NGC 1569 offer new insights into how how starburst winds are launched and the conditions under which they break out. I will review our work on this topic that has been largely based on observations obtained with WIYN and Hubble Space Telescope, and also briefly describe work in progress with Ellen Zweibel and Tova Yoast-Hull to better understand cosmic ray interactions in these types of systems.
Host: Dept
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