Time Dependent Adaptive Configuration Interaction Applied to Attosecond Charge Migration

Abstract

In this work, we present a time-dependent (TD) selected configuration interaction method based on our recently-introduced adaptive configuration interaction (ACI). We show that ACI, in either its ground or excited state formalisms, is capable of building a compact basis for use in real-time propagation of wave functions for computing electron dynamics. TD-ACI uses an iteratively selected basis of determinants in real-time propagation capable of capturing strong correlation effects in both ground and excited states, all with an accuracy---and associated cost---tunable by the user. We apply TD-ACI to study attosecond-scale migration of charge following ionization in small molecules. We first compute attosecond charge dynamics in a benzene model to benchmark and understand the utility of TD-ACI with respect to an exact solution. Finally, we use TD-ACI to reproduce experimentally determined ultrafast charge migration dynamics in iodoacetylene. TD-ACI is shown to be a valuable benchmark theory for electron dynamics, and it represents an important step towards accurate and affordable time-dependent multireference methods.

arXiv comment7 pages, 3 figures

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• Electron Dynamics with the Time-Dependent Density Matrix Renormalization Group
• Simulation of adiabatic quantum computing for molecular ground states
• A Parallel, Distributed Memory Implementation of the Adaptive Sampling Configuration Interaction Method
• Simulating real-time molecular electron dynamics efficiently using the time-dependent density matrix renormalization group
• Real-time propagation of adaptive sampling selected configuration interaction wave function
• paces: Parallelized Application of Co-Evolving Subspaces, a method for computing quantum dynamics on GPUs