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arXiv 2005.05678cond-mat.str-el
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二维Kitaev量子自旋液体中的拉曼散射极化和单自旋子的识别

Raman Scattering Polarization and Single Spinon Identification in Two-Dimensional Kitaev Quantum Spin Liquids

Shoji Yamamoto, Taku Kimura

摘要:

Kitaev蜂窝模型中Loudon-Fleury非弹性可见光散射的完全去极化是众所周知的。虽然它也发生在Heisenberg Kagome和三角形反铁磁体中,但我们证明它是几何起源的,而不是量子自旋液体所特有的。正方形平面几何中的Kitaev自旋液体确实表现出包含不同对称物种的偏振拉曼光谱,每个对称物种都是由与自旋相容的自旋子双生激发引起的,即由中介自旋子所属规范$\bm{k}$点对称群的双值不可约表示构成的与自旋相容的直积表示引起的。我们结合标准的点对称群分析的拉曼顶点在真实的空间和一个精心制作的投影对称群分析的拉曼散射介导的倒易空间中的马约拉纳自旋单独识别紧急自旋。

英文摘要:

Perfect deporalization of the Loudon-Fleury inelastic visible-light scattering in the Kitaev honeycomb model is well known. Though it happens in Heisenberg Kagome and triangular antiferromagnets as well, yet we prove it to be of geometric origin rather than peculiar to quantum spin liquids. A Kitaev spin liquid in the square planar geometry indeed exhibits polarized Raman spectra containing defferent symmetry species, each brought by symmetry-compatible spinon geminate excitations, i.e. arising from symmetry-compatible direct-product representations made of double-valued irreducible representations of mediating-spinon-belonging gauged $\bm{k}$-point symmetry groups. We combine a standard point-symmetry-group analysis of the Raman vertex in the real space and an elaborate projective-symmetry-group analysis of Raman-scattering-mediating Majorana spinons in the reciprocal space to identify emergent spinons singly.

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