774 citations · 4k across the 54 of their papers we have counts for
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cond-mat.str-el2004★ 64 cited
Hopping on the Bethe lattice: Exact results for densities of states and dynamical mean-field theory
Martin Eckstein, Marcus Kollar, Krzysztof Byczuk +1
We derive an operator identity which relates tight-binding Hamiltonians with arbitrary hopping on the Bethe lattice to the Hamiltonian with nearest-neighbor hopping. This provides…
cond-mat.mes-hall2004★ 21 cited
What are spin currents in Heisenberg magnets?
Florian Schuetz, Peter Kopietz, Marcus Kollar
We discuss the proper definition of the spin current operator in Heisenberg magnets subject to inhomogeneous magnetic fields. We argue that only the component of the naive "current…