86 citations · 206 across the 8 of their papers we have counts for
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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…
Temperature-dependent electronic structure and ferromagnetism in the d=oo Hubbard model studied by a modfied perturbation theory
T. Wegner, M. Potthoff, W. Nolting
The infinite-dimensional Hubbard model is studied by means of a modified perturbation theory. The approach reduces to the iterative perturbation theory for weak coupling. It is exa…
Interpolating self-energy of the infinite-dimensional Hubbard model: Modifying the iterative perturbation theory
M. Potthoff, T. Wegner, W. Nolting
We develop an analytical expression for the self-energy of the infinite-dimensional Hubbard model that is correct in a number of different limits. The approach represents a general…