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Current Seminars

​​​Thursday, September 8, 2016
LIGO: From Detector to Observatory
​​     Reception, 3:30pm in Dow 208
     Seminar, 4pm in Dow 107
​Ben Farr, University of Chicago
On September 14, 2015 LIGO made the first direct detection of gravitational waves, marking the transition of the LIGO instruments from detectors to observatories, and the beginning of the era of gravitational wave astronomy. On December 26, 2015 LIGO detected another high-significance event. GW150914 provided the first observational proof that binary black holes exist, and together with GW151226 showed that they exist in large numbers and merge frequently. I will present the methods behind the detection and characterization of these binary black hole mergers, as well as some of their astrophysical implications.​
Thursday, September 22, 2016
Autumnal Equinox Lecture: Astrophysics
​     Library Auditorium 3-5pm
     Baber Room 4:30-7:30pm
​​Hendrik Schatz, Director, JINA Center for the Evolution of the Elements, NSCL+MSU
Thursday, October 6, 2016
Electronic and Optical Excitations in Confined Nanostructures: Many-Body Pertubation Theory and Density Functional Approaches
​     Reception, 3:30pm in Dow 208
     Seminar, 4pm in Dow 107
​Serdar Ogut, Department of Physics University of Illinois at Chicago
​Electronic and optical excitations in confined nanostructures have been in the center of an intense research effort for the last two decades.  Achieving a detailed understanding of how light interacts with matter at the nanoscale and how it can be manipulated to tune material properties is a challenging endeavor that necessitates a reliably predictive modeling and simulation effort to aid and interpret experiments. Historically, excited state descriptions of chemical species and materials have lagged behind descriptions of the ground state.  This is especially true for density functional methods where the initial formalism was developed to describe only ground state properties. However, computational work during the last two decades on time-dependent density-functional-theory (TDDFT) and Green's function-based many-body perturbation theory approaches (the so-called GW-BSE formalism) have provided reliable methodologies to examine electronic and optical excited states from first principles within similar frameworks as ground state properties. This talk will mainly focus on the applications of real-space (TD)DFT and GW-BSE methods to a variety of confined nanostructures. 

After a brief discussion of the underlying theoretical and computational methods, I will present a summary of our recent studies performed on (i) the nature of electronic and optical excitations in bulk-truncated TiO2 nanocrystals, (ii) the effects of self-consistency and vertex corrections in the GW-BSE formalism in predicting excitation spectra of a set of aromatic molecules, and (iii) comparison of predictions from density-functional, many-body perturbation, and quantum chemistry techniques for photoelectron spectra of small copper oxide clusters.  The first principles results obtained for these systems at various levels of theory will be compared with available experimental data.
Thursday, October 20, 2016
​     Reception, 3:30pm in Dow 208
     Seminar, 4pm in Dow 107
​​Jaideep Singh, NSCL​




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