Spontaneous trimerization in a bilinear-biquadratic S=1 zig-zag chain

被引：29

作者：

Corboz, Philippe ^{[1
]}

Laeuchli, Andreas M. ^{[2
]}

Totsuka, Keisuke ^{[3
]}

Tsunetsugu, Hirokazu ^{[4
]}

机构：

[1] ETH, Inst Theoret Phys, CH-8093 Zurich, Switzerland

[2] Inst Romand Rech Numerique & Phys Materiaux IRRMA, CH-1015 Lausanne, Switzerland

[3] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan

[4] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.76.220404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent theoretical studies raised the possibility of a realization of spin nematic states in the S = 1 triangular lattice compound NiGa(2)S(4). We study the bilinear-biquadratic spin 1 chain in a zig-zag geometry by means of the density matrix renormalization group method and exact diagonalization. We present the phase diagram focusing on antiferromagnetic interactions. Adjacent to the known Haldane-double Haldane and the extended critical phase with dominant spin nematic correlations we find a trimerized phase with a nonvanishing energy gap. We discuss results for different order parameters, energy gaps, correlation functions, and the central charge, and make connection to field theoretical predictions for the phase diagram.

引用

页数：4

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