Soliton binding and low-lying singlets in frustrated odd-legged S= 1 /2 spin tubes
Soliton binding and low-lying singlets in frustrated odd-legged S= 1 /2 spin tubes
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受挫奇腿 S= 1 /2 自旋管中的孤子结合和低位单峰
DOI：
10.1103/physrevb.70.060405
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发表时间：
2004
影响因子：
3.7
通讯作者：
F. Mila
中科院分区：
文献类型：
--
作者：
A. Luscher;R. Noack;G. Misguich;V. Kotov;F. Mila
出于有趣的性质的钒自旋管Na 2 V3 O 7，我们表明，一个有效的自旋手征模型类似的标准海森堡奇腿S=1/2自旋管可以推导出挫折环间耦合，但与自旋手征耦合常数α，可以是任意小。使用密度矩阵重整化群和分析参数，我们表明，而自发二聚总是存在的，孤子成为绑定到低躺单线态α减少。强挫管的实验影响进行了讨论。
Motivated by the intriguing properties of the vanadium spin tube Na2V3O7, we show that an effective spin-chirality model similar to that of standard Heisenberg odd-legged S=1/2 spin tubes can be derived for frustrated inter-ring couplings, but with a spin-chirality coupling constant alpha that can be arbitrarily small. Using density matrix renormalization group and analytical arguments, we show that, while spontaneous dimerization is always present, solitons become bound into low-lying singlets as alpha is reduced. Experimental implications for strongly frustrated tubes are discussed.