Phase transition in the one-dimensional Kondo lattice model with attractive electron-electron interaction

Naokazu Shibata, Manfred Sigrist, Elmar Heeb

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The one-dimensional Kondo lattice model with attractive interaction among the conduction electrons is analyzed in the case of half-filling. It is shown that there are three distinct phases depending on the coupling constants of the model. Two phases have a spin and charge gap. While one shows a clear distinction of the spin and charge excitation spectrum the other phase may be characterized as a band insulator type where both excitations are due to two-particle states. The third phase is gapless in both channels and has quasi-long-range order in the spin- and charge-density-wave correlation. In this phase the spin and charge excitations have a clearly separated spectrum. For the analysis we discuss first two limiting cases. Then a density matrix renormalization group calculation on finite systems is applied to determine the phase diagram and the correlation functions in the gapped and gapless phase for general coupling constants.

Original languageEnglish
Pages (from-to)11084-11091
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number17
DOIs
Publication statusPublished - 1997 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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