摘要翻译:
用分数量子数寻找基本激发是现代凝聚态物理的一个中心挑战。我们探讨了几种材料在二维自旋1/2空间各向异性受挫海森堡反铁磁体的现实模型中的可能性。通过将Hilbert空间限制为精确的Heisenberg链本征态,我们导出了一个有效的Schr\'Odinger方程,该方程在弱链间耦合区有效。该方法得到的动力学自旋关联与三角反铁磁体Cs_2CuCl_4的非弹性中子测量结果在定量上一致。这种反铁磁体中的光谱特征可以归因于两种类型的激发:单个链的一维自旋子的下降和自旋子对相干传播的“三重子”束缚态。我们认为三重子是空间各向异性受抑反铁磁体的一般特征,它的产生是由于束缚自旋子对通过在链间传播而降低其动能。
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英文标题:
《Spinons and triplons in spatially anisotropic frustrated
antiferromagnets》
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作者:
Masanori Kohno, Oleg A. Starykh, Leon Balents
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最新提交年份:
2007
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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:
The search for elementary excitations with fractional quantum numbers is a central challenge in modern condensed matter physics. We explore the possibility in a realistic model for several materials, the spin-1/2 spatially anisotropic frustrated Heisenberg antiferromagnet in two dimensions. By restricting the Hilbert space to that expressed by exact eigenstates of the Heisenberg chain, we derive an effective Schr\"odinger equation valid in the weak interchain-coupling regime. The dynamical spin correlations from this approach agree quantitatively with inelastic neutron measurements on the triangular antiferromagnet Cs_2CuCl_4. The spectral features in such antiferromagnets can be attributed to two types of excitations: descendents of one-dimensional spinons of individual chains, and coherently propagating "triplon" bound states of spinon pairs. We argue that triplons are generic features of spatially anisotropic frustrated antiferromagnets, and arise because the bound spinon pair lowers its kinetic energy by propagating between chains.
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PDF链接:
https://arxiv.org/pdf/706.2012