Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-01-10
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, Revtex, with 3 embedded eps figures. To appear in Phys. Rev. B/Rapid Communications. Hardcopies of figures (or the en
Scientific paper
10.1103/PhysRevB.55.R6109
We present a simple theory for the description of the single particle excitations in the Kondo lattice model. Thereby we derive an `effective Hamiltonian' which describes the coherent propagation of single particle-like fluctuations on a strong coupling background. Even for f-electrons which are replaced by Kondo-spins, the resulting spectral function obeys the Luttinger theorem including the f-electrons, and our calculation fully reproduces the nontrivial variation of the spectral function and momentum distribution with electron density and parameter values as seen in exact diagonalization and density matrix renormalization group studies.
Eder Robert
Sawatzky George. A.
Stoica O.
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