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

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

2000-02-14

arxiv.org/abs/cond-mat/0002193v2

Physics

Condensed Matter

4 pages, 4 figures

Scientific paper

10.1143/JPSJ.69.1946

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. By 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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