Faculty Host: Sahar Sharifzadeh
Student Host: Tianlun Huang
Refreshments at 2:45 PM
Title: Picoscale Materials Engineering in Transition Metal Oxides: Two Examples
The atomic-scale structure and bonding in a material determines its resulting properties. Alterable or reversible bond distortions at the picometer scale modify a material’s electronic configuration and can create interesting physical and functional properties. Picoscale bond perturbations represent the ultimate length scale for materials engineering: any smaller, and the effects are too small to matter; any larger, and the bonds are completely broken so one is describing a different material. I will describe, using first principles theory together with parallel experimental results from my Yale collaborators, two examples where we can understand and/or design picoscale distortions in 3d transition metal oxides in order to control electron transport or relative orbital energies and occupancies.
* Ismail-Beigi, Walker, Disa, Rabe, and Ahn, “Picoscale materials engineering,” Nature Reviews Materials 2, 17060 (2017).
Sohrab Ismail-Beigi received his undergraduate degree in Physics from Harvard and his Ph.D. in Physics from MIT in 2000. After a postdoctoral fellowship at U.C. Berkeley, he moved to Yale in 2003 where he is now a Professor of Applied Physics with joint appointments in Physics and Mechanical Engineering and Materials Science. His materials research interests include 1D and 2D materials as well as complex oxide surfaces and interfaces including their electronic, magnetic, structural, and chemical properties. His recent method development work is on electronic structure methods for excited states and inclusion of localized electronic correlations via slave-boson approaches.