Gus Hart, Brigham Young University (CMU MSE)

Who: Gus Hart, Brigham Young University
When: 
Friday, September 10, 2021 - 12:15pm
Where: 
100 Porter Hall

Building Useful Machine-Learned Interatomic Potentials

Abstract: Interatomic Potentials have long been used for atomistic modeling where the interesting questions are out of reach by first-principles approaches. Traditional empirical potentials are typically fitted to experimental data. They typically have poor general accuracy but are physically well-behaved. On the other hand, machine-learned interatomic potentials are far more expressive than physically motivated interatomic potentials like Lennard-Jones, Stillinger-Weber, Embedded Atom Potentials, etc., but they are also more likely to be completely wrong outside of the training domain, are more difficult to train reliably, and are computationally expensive. We have developed MLIPs for the Hf-Ni-Ti shape memory alloy. We share cautionary tales, best practices for generating training sets, and demonstrate how community tools make for "easy entry" to realistic thermodynamic modeling with these potentials

Bio: Gus Hart s interested in the study materials physics. He wants to help change the world by inventing algorithms for discovering the materials of tomorrow, today. He is a professor in the Department of Physics and Astronomy at Brigham Young University (BYU). Dr. Hart also serves as an Associate Dean in the College of Physical and Mathematical Sciences. Before BYU, he was an assistant professor at Northern Arizona University (NAU). Prior to his academic appointments, Dr. Hart worked in the Solid State Theory Group with Alex Zunger at the National Renewable Energy Laboratory. He received a PhD from Univ. of California, Davis, under Barry M. Klein.