Density matrix renormalization group numerical study of the kagome antiferromagnet

被引：225

作者：

Jiang, H. C. ^{[1
,2
]}

Weng, Z. Y. ^{[1
]}

Sheng, D. N. ^{[2
]}

机构：

[1] Tsinghua Univ, Ctr Adv Study, Beijing 100084, Peoples R China

[2] Calif State Univ Northridge, Dept Phys & Astron, Northridge, CA 91330 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.101.117203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We numerically study the spin 1/2 antiferromagnetic Heisenberg model on the kagome lattice using the density-matrix renormalization group method. We find that the ground state is a magnetically disordered spin liquid, characterized by an exponential decay of spin-spin correlation function in real space and a magnetic structure factor showing system-size independent peaks at commensurate magnetic wave vectors. We obtain a spin triplet excitation gap Delta E(S=1)=0.055 +/- 0.005 by extrapolation based on the large size results, and confirm the presence of gapless singlet excitations. The physical nature of such an exotic spin liquid is also discussed.

引用

页数：4

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