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SUMMARY:Math and Physics Joint Colloquium - Dr. Tomáš Bzdušek
DESCRIPTION:Dr. Tomáš Bzdušek\, Paul Scherrer Institute and University of Zurich \nMathematics of Topological Insulators and Semimetals \nMany properties of crystalline materials\, such as conductivity or the tendency to become magnetically ordered at low temperatures\, derive from their so-called “electronic band structure.” Although this is an established notion in solid state physics\, dating back to the early days of quantum mechanics\, our understanding of electronic band structure has been greatly challenged and revolutionized over the past 15 years by the discovery of so-called topological materials. \nIn this colloquium\, I will first show how topology enters the description of electrons in crystalline solids – whether they are insulators\, semimetals or metals. This is achieved by encoding the electron Hamiltonian as a fiber bundle\, and by characterizing this bundle using homotopy theory. In the second part\, I will focus on our latest results\, which reveal a previously overlooked non-Abelian topological invariant. This discovery suggests possible braiding phenomena in the electronic band structure\, which I illustrate on a material example ZrTe. \nColloquium flyer available here
URL:https://uwm.edu/physics/event/math-and-physics-joint-colloquium-dr-tomas-bzdusek/
LOCATION:EMS E495\, 3200 North Cramer Street\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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DTSTART;TZID=America/Chicago:20200228T153000
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SUMMARY:Physics Colloquium - Gregory Rudnick
DESCRIPTION:Gregory Rudnick\, University of Kansas \nThe Life Cycle of Galaxies in Clusters Over 10 Billion Years \nGalaxies live in a range of environments\, characterized by their volume density. For example\, the densest regions of the Universe are in galaxy clusters\, which contain hundreds to thousands of galaxies all in pseudo gravitational virial equilibrium. These dense environments can in turn alter the properties of the galaxies themselves in striking ways via a variety of gravitational and hydrodynamic processes. The result of these processes alter galaxy shapes\, their internal dynamics\, and shuts off the formation of new stars. I will present work I have been doing to characterize the evolution of galaxies in clusters over the past 10 billion years as a way of understanding how the environment can affect galaxies.  \nI will describe how we have used extensive multi-wavelength data sets on distant clusters to form a picture in which infalling cluster galaxies likely have their gas supplies cut off\, their morphologies transformed\, and may even experience epochs of very frequent mergers.  I will then describe new results from a large program called Gemini Observations of Galaxies in Rich Environments (GOGREEN) which is the premier spectroscopic survey of distant clusters.  With the GOGREEN data\, we are finding that the quenching of galaxies in dense environments at high redshift may proceed very differently from that at redshifts less than one\, requiring a revision of our thoughts on how environment affects galaxy evolution at large lookback times. \nEvent flyer available here.
URL:https://uwm.edu/physics/event/physics-colloquium-greg-rudnick/
LOCATION:Lapham 160\, 3209 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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