102 citations · 378 across the 15 of their papers we have counts for
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cond-mat.str-el2001★ 5 cited
Random phase approximation for multi-band Hubbard models
J. Buenemann, F. Gebhard
We derive the random-phase approximation for spin excitations in general multi-band Hubbard models, starting from a collinear ferromagnetic Hartree-Fock ground state. The results a…
cond-mat.str-el2001★ 102 cited
Excitons in one-dimensional Mott insulators
F. H. L. Essler, F. Gebhard, E. Jeckelmann
We employ dynamical density-matrix renormalization group (DDMRG) and field-theory methods to determine the frequency-dependent optical conductivity in one-dimensional extended, hal…