86 citations · 206 across the 8 of their papers we have counts for
8 papers
Ferromagnetism in the Hubbard model
W. Nolting, M. Potthoff, T. Herrmann +1
We investigate the possibility and stability of bandferromagnetism in the single-band Hubbard model. This model poses a highly non-trivial many-body problem the general solution of…
Electron-correlation effects in appearance-potential spectra of Ni
M. Potthoff, T. Wegner, W. Nolting +5
Spin-resolved and temperature-dependent appearance-potential spectra of ferromagnetic Nickel are measured and analyzed theoretically. The Lander self-convolution model which relate…
Effects of Core-Hole Screening on Spin-Polarised Auger Spectra from Ferromagnetic Nickel
T. Wegner, M. Potthoff, W. Nolting
We calculate the spin- and temperature-dependent local density of states for ferromagnetic Ni in the presence of a core hole at a distinguished site in the lattice. Correlations am…
Theory of Spin-Resolved Auger-Electron Spectroscopy from Ferromagnetic 3d-Transition Metals
T. Wegner, M. Potthoff, W. Nolting
CVV Auger electron spectra are calculated for a multi-band Hubbard model including correlations among the valence electrons as well as correlations between core and valence electro…
The asymmetric single-impurity Anderson model - the modified perturbation theory
D. Meyer, T. Wegner, M. Potthoff +1
We investigate the single-impurity Anderson model by means of the recently introduced modified perturbation theory. This approximation scheme yields reasonable results away from th…
The moment sum rule and its consequences for ferromagnetism in the Hubbard model
M. Potthoff, T. Herrmann, T. Wegner +1
The sum rule for the moments of the spectral density is discussed for the single-band Hubbard model. It is shown that respecting the sum rule up to the order m=3 is conceptually im…