Phase diagram of the spin-1/2 bond-alternating two-leg ladder

被引：9

作者：

Nakamura, M ^{[1
]}

Yamamoto, T

Ide, K

机构：

[1] Sci Univ Tokyo, Fac Sci, Dept Appl Phys, Shinjuku Ku, Tokyo 1628601, Japan

[2] Sci Univ Tokyo, Fac Sci, Dept Phys, Shinjuku Ku, Tokyo 1628601, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2003年 / 72卷 / 05期

关键词：

phase diagram; spin ladder; string order parmeter; level-crossing method; bosonization;

D O I：

10.1143/JPSJ.72.1022

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study phase transition between two topologically different gapped states in the spin-1/2 bond-alternating two-leg Heisenberg ladder by investigating string order parameters and the level-crossing method based on the exact diagonalization. We determine the phase diagram on the plane of the bond-alternation delta and the rung-leg coupling ratio J(perpendicular to)/J, and conclude that the boundary is given as J(perpendicular to)/J proportional to delta(2/3) in the weak coupling region J(perpendicular to)/J, delta much less than 1.

引用

页码：1022 / 1025

页数：4

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