222 citations · 2k across the 49 of their papers we have counts for
6 papers · 1 filter
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…
Development of non-equilibrium Green's functions for use with full interaction in complex systems
Richard A. Lynn, Robert van Leeuwen
We present an ongoing development of an existing code for calculating ground-state, steady-state, and transient properties of many-particle systems. The development involves the ad…
Time-dependent Landauer-Büttiker formalism for superconducting junctions at arbitrary temperatures
Riku Tuovinen, Robert van Leeuwen, Enrico Perfetto +1
We discuss an extension of our earlier work on the time-dependent Landauer--Büttiker formalism for noninteracting electronic transport. The formalism can without complication be ex…
Many-body Green's function theory for electron-phonon interactions: the Kadanoff-Baym approach to spectral properties of the Holstein dimer
N. Säkkinen, Y. Peng, H. Appel +1
We present a Kadanoff-Baym formalism to study time-dependent phenomena for systems of interacting electrons and phonons in the framework of many-body perturbation theory. The forma…
First-principles nonequilibrium Green's function approach to transient photoabsorption: Application to atoms
E. Perfetto, A. -M. Uimonen, R. van Leeuwen +1
We put forward a first-principle NonEquilibrium Green's Function (NEGF) approach to calculate the transient photoabsorption spectrum of optically thin samples. The method can deal…
Curvature in graphene nanoribbons generates temporally and spatially focused electric currents
C. G. Rocha, R. Tuovinen, R. van Leeuwen +1
Today graphene nanoribbons and other graphene-based nanostructures can be synthesized with atomic precision. But while investigations have concentrated on straight graphene ribbons…