Thermodynamic Properties of the One-Dimensional Kondo Insulators Studied by the Density Matrix Renormalization Group Method

Naokazu Shibata, Matthias Troyer, Kazuo Ueda, Beat Ammon, Manfred Sigrist, Manfred Sigrist

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Thermodynamic properties of the one-dimensional Kondo lattice model at half-filling are studied by the density matrix renormalization group method applied to the quantum transfer matrix. Spin susceptibility, charge susceptibility, and specific heat are calculated down to T = 0.1t for various exchange constants. The obtained results clearly indicate crossover behavior from the high-temperature regime of nearly independent localized spins and conduction electrons to the low-temperature regime where the two degrees of freedom couple strongly. The low-temperature energy scales of the charge and spin susceptibilities are determined and are equal to the quasiparticle gap and the spin gap, respectively, for weak exchange couplings.

Original languageEnglish
Pages (from-to)1086-1089
Number of pages4
Journaljournal of the physical society of japan
Volume67
Issue number4
DOIs
Publication statusPublished - 1998
Externally publishedYes

Keywords

  • Kondo insulator
  • Kondo lattice
  • density matrix
  • renormalization group
  • specific heat
  • susceptibility
  • transfer matrix

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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