ISOTROPIC SPIN-1 CHAIN WITH TWISTED BOUNDARY-CONDITION

被引：64

作者：

FATH, G

SOLYOM, J

机构：

[1] Research Institute for Solid State Physics, H-1525 Budapest

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.47.872

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The possible ground states and the phase transitions of a spin-1 chain with bilinear-biquadratic exchange are studied numerically. In order to see better the real asymptotic behavior of the infinite system and to determine the necessary degeneracies, a twisted boundary condition is used that reduces the finite-size effects. This calculation confirms that a second-order Ising-type phase transition occurs at the Takhtajan-Babujian point from the dimerized phase to the singlet Haldane phase. The transition at the Lai-Sutherland point, to a massless phase with three soft modes, is found to be of Kosterlitz-Thouless type.

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页码：872 / 881

页数：10

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