摘要翻译：
本文讨论了在蜂窝晶格上具有部分填充的$T_{2g}$能级的自旋一离子的自旋轨道模型的基态。我们发现轨道自由度引起自旋的自发二聚化，并驱动它们进入由晶格的硬核二聚体（自旋单重态）覆盖所跨越的非磁流形。通过磁弹性耦合引入了合作的“二聚体Jahn-Teller”效应，并证明了该效应能提高二聚体的取向简并，导致一种特殊的价键晶体图案。本理论提供了低温下Li$2$RuO$3$化合物非磁性二聚超结构的理论解释。
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英文标题：
《Classical dimers and dimerized superstructure in orbitally degenerate
  honeycomb antiferromagnet》
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作者：
G. Jackeli and D. I. Khomskii
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最新提交年份：
2008
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分类信息：

一级分类：Physics        物理学
二级分类：Strongly Correlated Electrons        强关联电子
分类描述：Quantum magnetism, non-Fermi liquids, spin liquids, quantum criticality, charge density waves, metal-insulator transitions
量子磁学，非费米液体，自旋液体，量子临界性，电荷密度波，金属-绝缘体跃迁
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一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
  We discuss the ground state of the spin-orbital model for spin-one ions with partially filled $t_{2g}$ levels on a honeycomb lattice. We find that the orbital degrees of freedom induce a spontaneous dimerization of spins and drive them into nonmagnetic manifold spanned by hard-core dimer (spin-singlet) coverings of the lattice. The cooperative ``dimer Jahn-Teller'' effect is introduced through a magnetoelastic coupling and is shown to lift the orientational degeneracy of dimers leading to a peculiar valence bond crystal pattern. The present theory provides a theoretical explanation of nonmagnetic dimerized superstructure experimentally seen in Li$_2$RuO$_3$ compound at low temperatures.
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PDF链接：
https://arxiv.org/pdf/802.2692