Haldane gap for the S=2 antiferromagnetic Heisenberg chain revisited

被引：44

作者：

Wang, XQ

Qin, SJ

Yu, L

机构：

[1] EPFL, IRRMA, Inst Romand Rech Numer Phys Mat, CH-1015 Lausanne, Switzerland

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[3] Inst Theoret Phys, Beijing 100080, Peoples R China

[4] Int Ctr Theoret Phys, I-34100 Trieste, Italy

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.60.14529

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using the density matrix renormalization group (DMRG) technique, we carry out a large scale numerical calculation for the S = 2 antiferromagnetic Heisenberg chain. Performing systematic scaling analysis for both the chain length L and the number of optimal states kept in the iterations m, the Haldane gap Delta (2) is estimated accurately as (0.0876 +/- 0.0013)J. Our systematic analysis for the S = 2 chains not only clarifies the controversies arising from various DMRG calculations and Monte Carlo simulations, but also sheds light on how to obtain reliable results from the DMRG calculations for other similar complicated systems. [S0163-1829(99)03237-3].

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页码：14529 / 14532

页数：4

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