John Parkhill

John Parkhill

Quantum Chemistry

Biography

2013-present
Assistant Professor, University of Notre Dame
2010-2012
Postdoctoral Fellow, Harvard University
2010
Ph.D. in Theoretical Chemistry, University of California, Berkeley
2005
B.S. in Chemistry, B.S. in Mathematics, University of Chicago

Selected Awards

2005
Norman H. Nachtrieb Award, University of Chicago
2003
Pfizer Undergraduate Research Fellow

Research Interests

Within a little more than 50 years, our ability to calculate properties of molecular systems using only the fundamental physics governing them has grown from computational art into a often predictive tool. Molecular geometries and the thermodynamics of chemical reactions can be accurately computed using electronic structure. Beyond static properties many of the approximations which make ground state electronic structure robust no longer hold. Errors in excited state energies are on the same order of magnitude as the energies themselves and correlate poorly with the realities of experiments. Trajectories of electronic dynamics: the motions of electrons and ions in batteries and photovoltaics, are currently too expensive to compute for most timescales of interest. The goal of my group is to provide physical models and computational tools to make modeling electronic dynamics more routine and predictive. This involves running simulations of energy materials, recognizing the shortcomings of those simulations, doing the pencil & paper physics to improve the model and realizing that model in computer code.

Recent Papers

  • Nguyen, T.S.; Parkhill, J.A. "Nonradiative Relaxation in Real-time Electronic Dynamics OSCF2: Organolead Triiodid Perovskite." J. Phys. Chem. A 2016, just accepted.
  • Nguyen, T.S.; Koh, J.H.; Lefelhocz, S.; Parkhill, J.A. "Black-Box, Real-Time Simulations of Transient Absorption Spectroscopy." J. Phys. Chem. Lett. 2016, 7(8), 1590-1595.
  • Yao, K; Parkhill, J.A. "Kinetic Energy of Hydrocarbons as a Function of Electron Density and Convolutional Neural Networks." J. Chem. Theory Comput. 2016, 12(3), 1139-1147.
  • Nguyen, T.S.; Parkhill, J.A. "Nonadiabatic Dynamics for Electrons at Second-Order: Real-Time TDDFT and OSCF2." J. Chem. Theory Comput. 2015, 11 (7), 2918-2924.
  • Nguyen, T.S.; Nanguneri, R.; Parkhill, J.A. "How electronic dynamics with Pauli exclusion produces Fermi-Dirac statistics." J. Chem. Phys. 2015, 142, 134113.
  • McClean, J.R.; Parkhill, J.A.; Aspuru-Guzika, A. "Feynman's clock, a new variational principle, and parallel-in-time quantum dynamics." P. Natl. Acad. Sci. USA 2013, 110 (41), E3901-3909.

Contact Information

Primary Research Areas

Research Specialties