284 citations · 4.3k across the 108 of their papers we have counts for
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cond-mat1996★ 56 cited
Dynamical density-density correlations in one-dimensional Mott insulators
Walter Stephan, Karlo Penc
The dynamical density-density correlation function is calculated for the one-dimensional, half-filled Hubbard model extended with nearest neighbor repulsion using the Lanczos algor…
cond-mat1996★ 70 cited
Ferromagnetism in multi--band Hubbard models: From weak to strong Coulomb repulsion
Karlo Penc, Hiroyuki Shiba, Frédéric Mila +1
We propose a new mechanism which can lead to ferromagnetism in Hubbard models containing triangles with different on-site energies. It is based on an effective Hamiltonian that we…