74 citations · 513 across the 21 of their papers we have counts for
8 papers · 1 filter
Time-linear scaling NEGF methods for real-time simulations of interacting electrons and bosons. I. Formalism
Yaroslav Pavlyukh, Enrico Perfetto, Daniel Karlsson +2
Simulations of interacting electrons and bosons out of equilibrium, starting from first principles and aiming at realistic multiscale scenarios, is a grand theoretical challenge. H…
Fast Green's function method for ultrafast electron-boson dynamics
Daniel Karlsson, Robert van Leeuwen, Yaroslav Pavlyukh +2
The interaction of electrons with quantized phonons and photons underlies the ultrafast dynamics of systems ranging from molecules to solids, and it gives rise to a plethora of phy…
The Generalized Kadanoff-Baym Ansatz with Initial Correlations
Daniel Karlsson, Robert van Leeuwen, Enrico Perfetto +1
Within the non-equilibrium Green's function (NEGF) formalism, the Generalized Kadanoff-Baym Ansatz (GKBA) has stood out as a computationally cheap method to investigate the dynamic…
Time-dependent density-functional theory for strongly interacting electrons
Luis Cort, Daniel Karlsson, Giovanna Lani +1
We consider an analytically solvable model of two interacting electrons that allows for the calculation of the exact exchange-correlation kernel of time-dependent density functiona…
Partial self-consistency and analyticity in many-body perturbation theory: particle number conservation and a generalized sum rule
Daniel Karlsson, Robert van Leeuwen
We consider a general class of approximations which guarantees the conservation of particle number in many-body perturbation theory. To do this we extend the concept of -derivab…
Computing Exact Self-Energies with Polynomial Expansion
M. Hyrkäs, D. Karlsson, R. van Leeuwen
We give details on how to calculate spectral functions and Green's functions for finite systems using the Chebyshev polynomial expansion method. We apply the method to a finite And…