LaCNS Seminars Fall 2018
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1) Monday, August 20, 3:00 pm, 1008B Digital Media Center
Dr. Hang Chi (Research Fellow, University of Michigan), host Rongying Jin
Abstract: Thermoelectric materials can recover waste industrial heat and convert it to electricity as well as provide efficient local cooling of electronic devices. We first demonstrate that the efficiency (determined by the dimensionless figure-of-merit ZT) of such environmentally responsible and exceptionally reliable solid-state energy conversion can be enhanced through electronic band engineering in Mn-doped SnTe. Moreover, using thin film configurations, systematic study in Bi2Te3-based molecular beam epitaxial (MBE) films grown on sapphire (0001) and/or BaF2 (111) substrates, has revealed that the peak of phonon-drag thermopower can be tuned by the choice of substrates with different Debye temperatures. Finally, ZrTe5, known for large thermopower at cryogenic temperatures, has recently been revisited as a potential topological platform, hosting a highly anisotropic three-dimensional Dirac band. Transport measurements suggest the long-debated anomalous resistivity peak could be associated with a Lifshitz transition in the Dirac band. Such Lifshitz transition is readily controllable by means of doping. The anomaly peak temperature monotonically increases with the chemical potential, serving as an effective knob for fine tuning transport properties in pentatelluride-based Dirac semimetals.
2) Monday, October 8, 3:00 pm, 1008B Digital Media Center
Dr. Despina Louca (Professor, Experimental Condensed Matter Physics, University of Virginia), host Ilya Vekhter
3) Monday, October 15, 3:00 pm, 1008B Digital Media Center
Dr. Lilo Pozzo (The Weyerhaeuser Endowed Associate Professor of Chemical Engineering, University of Washington), host Bhuvnesh Bharti
4) Monday, November 5, 12:30 pm, 215 Williams Hall
Dr. Susan Krueger (Research Physicist, NIST Center for Neutron Research), host Gerald Schneider
"Structure and Function of Biological Macromolecules in Solution: The Unique Role of Small Angle Neutron Scattering"
5) Monday, November 12, 12:30 pm, 215 Williams Hall
Dr. John Katsaras (Senior Scientist, ORNL Large Scale Structures Neutron Sciences Directorate)
"Static and Dynamic Neutron Scattering Studies of Biologically Relevant Membranes"
Abstract: Biomembranes are the active boundary between cells and their surroundings. They are sophisticated and dynamic machines that perform a diverse array of functions, including selective transport, localization, communication and recognition, to name a few. It is also widely accepted that the plasma membrane is laterally heterogeneous containing nanoscopic regions enriched in certain types of lipids, which have different physical properties from the surrounding lipids. These functional lipid domains in biology are commonly referred to as “rafts”. Rafts have been implicated in a wide range of cellular functions, including signal transduction, drug uptake, and interactions with pathogens. In recent years, we have used small angle neutron scattering (SANS) and neutron spin echo (NSE) to study nanoscopic lipid domains in model membrane systems [1-3] and more recently, in the Gram-positive bacterium Bacillus subtilis in which the first ever observation of lipid domains was made . The seminar will conclude with future directions of potential interest to biophysicists and biologists.
6) Friday, November 30, 12:30 pm, 215 Williams Hall
Dr. Jeremy Smith (Director, ORNL Center for Molecular Biophysics)