337 citations · 2.1k across the 54 of their papers we have counts for
3 papers · 1 filter
Kadanoff-Baym approach to double-excitations in finite systems
N. Säkkinen, M. Manninen, R. van Leeuwen
We benchmark many-body perturbation theory by studying neutral, as well as non-neutral, excitations of finite lattice systems. The neutral excitation spectra are obtained by time-p…
Magnetism of quantum dot clusters: A Hubbard model study
J. -P. Nikkarila, M. Koskinen, M. Manninen
Magnetic properties of two and three-dimensional clusters of quantum dots are studied with exact diagonalization of a generalized Hubbard model. We study the weak coupling limit, w…
Magnetic phases of one-dimensional lattices with 2 to 4 fermions per site
J. -P. Nikkarila, M. Koskinen, S. M. Reimann +1
We study the spectral and magnetic properties of one-dimensional lattices filled with 2 to 4 fermions (with spin 1/2) per lattice site. We use a generalized Hubbard model that take…