74 citations · 216 across the 9 of their papers we have counts for
4 papers · 1 filter
Ferromagnetism and the temperature-dependent electronic structure in thin Hubbard films
T. Herrmann, W. Nolting
The magnetic behavior of thin ferromagnetic itinerant-electron films is investigated within the strongly correlated single-band Hubbard model. For its approximate solution we apply…
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…
Optimization of alloy-analogy-based approaches to the infinite-dimensional Hubbard model
M. Potthoff, T. Herrmann, W. Nolting
An analytical expression for the self-energy of the infinite-dimensional Hubbard model is proposed that interpolates between different exactly solvable limits. We profit by the com…
Ferromagnetism and Temperature-Driven Reorientation Transition in Thin Itinerant-Electron Films
T. Herrmann, M. Potthoff, W. Nolting
The temperature-driven reorientation transition which, up to now, has been studied by use of Heisenberg-type models only, is investigated within an itinerant-electron model. We con…