Effective Spinless Fermions in the strong-coupling Kondo Model

Winfried Koller*, Alexander Prüll, Hans Gerd Evertz, Wolfgang von der Linden

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Starting from the two-orbital Kondo-lattice model with classical (formula presented) spins, an effective spinless fermion model is derived for strong Hund coupling (formula presented) with a projection technique. The model is studied by Monte Carlo simulations and analytically using a uniform hopping approximation. The results for the spinless fermion model are in remarkable agreement with those of the original Kondo-lattice model, independent of the carrier concentration, and even for moderate Hund coupling (formula presented) Phase separation, the phase diagram in uniform hopping approximation, as well as spectral properties including the formation of a pseudogap are discussed for both the Kondo-lattice and the effective spinless fermion model in one and three dimensions.

Original languageEnglish
Article number144425
Number of pages10
JournalPhysical Review B
Issue number14
Publication statusPublished - 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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