Spin-chirality duality in a spin ladder with four-spin cyclic exchange.
Spin-chirality duality in a spin ladder with four-spin cyclic exchange.
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DOI：
10.1103/physrevlett.90.087204
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发表时间：
2002-06
影响因子：
8.6
通讯作者：
T. Hikihara;T. Momoi;X. Hu
中科院分区：
文献类型：
--
作者：
T. Hikihara;T. Momoi;X. Hu
研究了两腿S=1/2阶梯中四自旋循环交换对磁性的影响。我们建立了一个精确的自旋手性对偶变换，当四自旋交换J4为两自旋交换J4的一半时，体系是自对偶的。利用密度-矩阵重整群方法和对偶关系，我们发现四自旋交换使得矢量-手性相关占主导地位。在大J4上首次发现了“手性短程共振-价键”相。
Effect of four-spin cyclic exchange on magnetism is studied in the two-leg S=1/2 ladder. We develop an exact spin-chirality duality transformation, under which the system is self-dual when the four-spin exchange J4 is half of the two-spin exchange. Using the density-matrix renormalization-group method and the duality relation, we find that the four-spin exchange makes the vector-chirality correlation dominant. A "chirality short-range resonating-valence-bond" phase is identified for the first time at large J4.