Effect of the orbital level difference in doped spin-1 chains

被引：5

作者：

Ammon, B ^{[1
]}

Imada, M ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Minato Ku, Tokyo 1068666, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2000年 / 69卷 / 07期

关键词：

spin-1; systems; orbital level-difference; Mott-Hubbard transition; superconductivity; string order;

D O I：

10.1143/JPSJ.69.1946

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：1946 / 1949

页数：4

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