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

Beat Ammon, Masatoshi Imada

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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
Volume69
Issue number7
DOIs
Publication statusPublished - 2000 Jan 1
Externally publishedYes

Fingerprint

orbitals
renormalization group methods
strings
fermions
excitation

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Effect of the Orbital Level Difference in Doped Spin-1 Chains. / Ammon, Beat; Imada, Masatoshi.

In: Journal of the Physical Society of Japan, Vol. 69, No. 7, 01.01.2000, p. 1946-1949.

Research output: Contribution to journalArticle

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AB - 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.

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