103 citations · 252 across the 10 of their papers we have counts for
10 papers
Sources of negative tunneling magneto-resistance in multilevel quantum dots with ferromagnetic contacts
S. Koller, J. Paaske, M. Grifoni
We analyze distinct sources of spin-dependent energy level shifts and their impact on the tunneling magnetoresistance (TMR) of interacting quantum dots coupled to collinearly polar…
Dynamical symmetry breaking in vibration-assisted transport through nanostructures
Abdullah Yar, Andrea Donarini, Sonja Koller +1
A theoretical model of a single molecule coupled to many vibronic modes is presented. At low energies, transport is dominated by electron-vibron processes where transfer of an elec…
Dynamical symmetry breaking in vibration-assisted transport through nanostructures
Abdullah Yar, Andrea Donarini, Sonja Koller +1
A theoretical model of a single molecule coupled to many vibronic modes is presented. At low energies, transport is dominated by electron-vibron processes where transfer of an elec…
Density-operator approaches to transport through interacting quantum dots: Simplifications in fourth-order perturbation theory
Sonja Koller, Martin Leijnse, Maarten R. Wegewijs +1
Various theoretical methods address transport effects in quantum dots beyond single-electron tunneling while accounting for the strong interactions in such systems. In this paper w…
Inelastic cotunneling in quantum dots and molecules with weakly broken degeneracies
Georg Begemann, Sonja Koller, Milena Grifoni +1
We calculate the nonlinear cotunneling conductance through interacting quantum dot systems in the deep Coulomb blockade regime using a rate equation approach based on the T-matrix…
Spin-dependent transport through interacting graphene armchair nanoribbons
Sonja Koller, Leonhard Mayrhofer, Milena Grifoni
We investigate spin effects in transport across fully interacting, finite size graphene armchair nanoribbons (ACNs) contacted to collinearly spin-polarized leads. In such systems,…