Merging Features from Green's Functions and Time Dependent Density Functional Theory : A Route to the Description of Correlated Materials out of Equilibrium?
Hopjan, M., Karlsson, D., Ydman, S., Verdozzi, C., & Almbladh, C.-O. (2016). Merging Features from Green's Functions and Time Dependent Density Functional Theory : A Route to the Description of Correlated Materials out of Equilibrium?. Physical Review Letters, 116 (23), 236402. doi:10.1103/PhysRevLett.116.236402
Published inPhysical Review Letters
© 2016 American Physical Society. Published in this repository with the kind permission of the publisher.
We propose a description of nonequilibrium systems via a simple protocol that combines exchangecorrelation potentials from density functional theory with self-energies of many-body perturbation theory. The approach, aimed to avoid double counting of interactions, is tested against exact results in Hubbardtype systems, with respect to interaction strength, perturbation speed and inhomogeneity, and system dimensionality and size. In many regimes, we find significant improvement over adiabatic time dependent density functional theory or second Born nonequilibrium Green’s function approximations. We briefly discuss the reasons for the residual discrepancies, and directions for future work.