Effect of the Orbital Level Difference in Doped Spin-1 Chains

Beat Ammon*, Masatoshi Imada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The doping of a two-orbital chain with mobile S = 1/2 fermions and strong Hund's rule couplings stabilizing the S = 1 spins strongly depends on the presence of a level difference among these orbitals. Using density matrix renormalization group (DMRG) methods, we find a finite spin gap upon doping and dominant pairing correlations without level difference, whereas the presence of a level difference leads to dominant charge density wave (CDW) correlations with gapless spin-excitations. The string correlation function also shows qualitative differences between the two models.

Original languageEnglish
Pages (from-to)1946-1949
Number of pages4
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - 2000 Jul
Externally publishedYes


  • Mott-Hubbard transition
  • Orbital level-difference
  • Spin-1 systems
  • String order
  • Superconductivity

ASJC Scopus subject areas

  • General Physics and Astronomy


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