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Department of Physics

Loren Greenman

Loren GreenmanAssistant Professor
308 Cardwell Hall
Group Webpage 

Ph.D. University of Chicago, 2011
M.S.  University of Chicago, 2007
B.S.   Chemistry, University of Minnesota, 2006
B. Ch. En. Chemical Engineering, University of Minnesota, 2006

Research Area

Theoretical Atomic, Molecular & Optical Physics 

My group is interested in describing the interactions of laser pulses with molecules. Laser pulses are getting shorter and more intense, allowing experimentalists to probe electronic and nuclear dynamics on their natural timescales. However, complex dynamics emerge at these timescales. Modern theories have difficulty describing non-adiabatic coupling, high-lying molecular excited states, and unbound electrons, especially for larger molecules. We have recently developed adaptive grid techniques to address some of these complications. We also develop and use modern electronic structure methods to describe these systems.

As the target molecules of laser experiments get larger, describing their complicated structure and dynamics becomes a greater challenge. Our methods are at the interface of AMO physics, modern quantum chemistry, and high performance computing. Distributed parallel computation drives our work and enables us to consider larger and more complex systems.

It is our ultimate goal to design and describe "molecular movies", dynamical laser experiments that record in real time the electron and nuclear motion and correlation in chemical processes. We hope to use these techniques to learn more about photochemical reactions, efficient conversion between photon energy (including solar) and chemical energy, and photon-driven biological processes.

Recent Selected Publications

L. Greenman, R. R. Lucchese, C. W. McCurdy, arXiv: 1708.03679 (2017).  "Variational treatment of electron-polyatomic molecule scattering calculations using adaptive overset grids"

L. Greenman, K. B. Whaley, D. J. Haxton, and C. W. McCurdy, Phys. Rev. A 96, 013411 (2017).  “Optimized pulses for Raman excitation through the continuum: verification using multi-configurational timedependent Hartree-Fock"

L. Greenman, C. P. Koch, and K. B. Whaley, Phys. Rev. A 92, 013407 (2015).  “Laser pulses for coherent xuv Raman excitation” 

L. Greenman, H. D. Whitley, and K. B. Whaley, Phys. Rev. B 88, 165102 (2013). “Large-scale atomistic density functional theory calculations of phosphorus-doped silicon quantum bits

S. Pabst, L. Greenman, P. J. Ho, D. A. Mazziotti, and R. Santra, Phys. Rev. Lett. 106, 053003 (2011).  "Decoherence in attosecond photoionization"

L. Greenman, P. J. Ho, S. Pabst, E. Kamarchik, D. A. Mazziotti, and R. Santra, Phys. Rev. A 82, 023406 (2010). "Implementation of the time-dependent configuration-interaction singles method for atomic strong-field processes"

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