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arXiv 0802.2392cond-mat.str-el
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具有四自旋循环交换的自旋梯能级的反铁磁有序:Lieb-Mattis定理的推广

Antiferromagnetic ordering of energy levels for spin ladder with four-spin cyclic exchange: Generalization of the Lieb-Mattis theorem

Tigran Hakobyan

摘要:

将Lieb-Mattis定理推广到具有四自旋循环交换相互作用的反铁磁自旋梯模型。我们证明了当J>2K时,能级的反铁磁有序分别发生在两个扇区中,这两个扇区在关于阶梯纵轴的反射下保持对称和反对称.我们还证明了在自对偶点J=2K处,Lieb-Mattis规则在具有固定数量的梯级单态的扇区中成立。在这两种情况下,它与具有适当自旋数的Haldom链的类似规则一致。

英文摘要:

The Lieb-Mattis theorem is generalized to an antiferromagnetic spin-ladder model with four-spin cyclic exchange interaction. We prove that for J>2K, the antiferromagnetic ordering of energy levels takes place separately in two sectors, which remain symmetric and antisymmetric under the reflection with respect to the longitudinal axis of the ladder. We prove also that at the self-dual point J=2K, the Lieb-Mattis rule holds in the sectors with fixed number of rung singlets. In both cases, it agrees with the similar rule for Haldane chain with appropriate spin number.

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