[LA-SiGMA] FW: LASiGMA Seminar Wednesday, March 12th - Dr. Serdar Ogut, 3:30pm

[shelley lee]

Dear All,

As a reminder, Dr. Serdar Ogut of The University of Illinois will be giving
a talk today, March 12th at 3:30pm, 117 Richardson Hall, Tulane University.
The title of his talk is "Electronic and Optical Excitations in Confined
Nanostructures: Density Functional versus Many-Body versus Classical
Theories."

Abstract:
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, relatively recent computational work
on time-dependent density-functional-theory (TDDFT) and a Green's
function-based many-body perturbation theory approach (so-called GWBSE) have
provided new 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 these 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 on (i) the
electronic and optical properties of noble metal clusters Agn, Aun, and Cun
(n = 2 - 20) using TDDFT and GWBSE, highlighting the important role that the
shallow d electrons play in their optical properties, (ii) the electronic
excitations and exciton binding energies in Si nanoshells, and (iii) the
nature of the electronic and optical excitations in bulk-truncated rutile
TiO2 nanoclusters up to 1.5 nm in size. The first principles results
obtained for these systems at various levels of theory will be compared with
available experimental data. A common theme that will appear in all these
systems is that many of the electronic and optical properties of this wide
range of materials systems, which are in the sub-nanometer to a few nm size
range, can be reproduced remarkably well by using classical electrodynamics
in conjunction with bulk dielectric properties.

Biography:
Serdar Ogut received his PhD in physics from Yale University in 1995, after
which he worked as a postdoctoral research associate at the University of
Minnesota, Department of Chemical Engineering and Materials Science. In Fall
2001, he joined the University of Illinois at Chicago (UIC) as an assistant
professor, and moved through the ranks (Associate Professor in 2005, Full
Professor in 2010).

He is a computational materials and condensed matter physicist with
expertise in first principles modeling of structural, electronic, and
optical properties of various classes of materials, in particular,
transition metal oxides, electronic materials, ceramics, and nanostructures.

He served as a member of Physical Review B Editorial Board for 6 years (2008
through 2013), and has worked as a program director in the Division of
Materials Research at the National Science Foundation (from 10/2009 through
10/2012, and 12/2013 to present). He is a fellow of the American Physical
Society, and the recipient of 3 peer-reviewed Teaching Awards at UIC (2004,
2008, and 2009) and a J. Tinsley Oden fellowship at the University of Texas
at Austin (2009).

Note, this seminar will ONLY be available via abobe connect. To access the
talk, please click on the link provided: https://breeze.tulane.edu/lasigma/

Regards,

Shelley Lee
Project Coordinator
225-578-0465




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