Density-matrix renormalization-group study of the spin gap in a one-dimensional Hubbard model: Effect of the distant transfer and exchange coupling

被引：37

作者：

Arita, R ^{[1
]}

Kuroki, K

Aoki, H

Fabrizio, M

机构：

[1] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[2] INFM, I-34013 Trieste, Italy

[3] Int Sch Adv Studies, I-34013 Trieste, Italy

来源：

PHYSICAL REVIEW B | 1998年 / 57卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.57.10324

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin gap of a one-dimensional repulsive Hubbard model is numerically calculated with the density-matrix renormalization group, with a special emphasis on the effect of a next-nearest-neighbsr hopping (t') and the nearest-neighbor ferromagnetic exchange (J) interact ion. At half filling, a significant spin gap opens if \t'\similar or equal to\t\ and J=0, in agreement with the weak-coupling theory, while the gap is strongly suppressed by the introduction of J. On the other hand, the quarter-filled system has very small spin gaps regardless of the values of t' and J. Implications for the CuO2 chain in Sr14Cu24O41 and related materials are discussed. [S0163-1829(98)07617-6].

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页码：10324 / 10327

页数：4

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