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arXiv 0901.4900cond-mat.str-el
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自旋3/2二聚体模型

Spin 3/2 dimer model

Stephan Rachel

摘要:

本文给出了弱二聚价键固态的一个任意半积分S的亲哈密顿量。当S=1/2时,模型简化为Majumdar-Ghosh哈密顿量,我们讨论S=3/2时的模型及其性质。它的简并基态是讨论自旋3/2链二聚化最常用的玩具模型态。特别是,它描述了杂质诱导的二聚体相在Cr 8 Ni最近提出的。我们指出,哈密顿量的显式构造及其主要特征适用于任意半整数自旋S。

英文摘要:

We present a parent Hamiltonian for weakly dimerized valence bond solid states for arbitrary half-integral S. While the model reduces for S=1/2 to the Majumdar-Ghosh Hamiltonian we discuss this model and its properties for S=3/2. Its degenerate ground state is the most popular toy model state for discussing dimerization in spin 3/2 chains. In particular, it describes the impurity induced dimer phase in Cr8Ni as proposed recently. We point out that the explicit construction of the Hamiltonian and its main features apply to arbitrary half-integral spin S.

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