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Field-induced dynamical properties of the XXZ model on a honeycomb lattice

机译：蜂窝格子上XXZ模型的场致动力学特性

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摘要

We present a comprehensive 1/S study of the field-induced dynamical properties of the nearest-neighbor XXZ antiferromagnet on a honeycomb lattice using the formalism of nonlinear spin-wave theory developed for this model. The external magnetic field controls spin frustration in the system and induces noncollinearity of the spin structure, which is essential for the two-magnon decay processes. Our results include an intriguing field-evolution of the regions of the Brillouin zone wherein decays of spin excitations are prominent, a detailed classification of the decay channels involving magnons from both excitation branches, and a thorough analysis of the singularities in the magnon spectra due to coupling to the two-magnon continuum, all of which are illustrated for several field and anisotropy values. We highlight a number of features related to either the non-Bravais nature of the lattice or the existence of the Dirac-like points in the spectrum. In addition, the asymptotic behavior of the decay rates near high-symmetry points is analyzed in detail. The inelastic neutron-scattering spin-spin structure factor is obtained in the leading 1/S order and is shown to exhibit qualitatively distinct fingerprints of the decay-induced magnon dynamics such as quasiparticle peaks broadened by decays and strong spectral weight redistribution.
机译：我们使用此模型开发的非线性自旋波理论的形式，对蜂窝状晶格上最邻近的XXZ反铁磁体的场致动力学特性进行全面的1 / S研究。外部磁场控制系统中的自旋失调，并引起自旋结构的非共线性，这对于两磁子衰减过程至关重要。我们的结果包括一个有趣的布里渊区区域的自发激发衰减显着的场演化，涉及来自两个激发分支的磁振子的衰变通道的详细分类，以及对由于耦合到两个马格诺连续体，所有这些都针对几个场和各向异性值进行了说明。我们强调了一些与晶格的非布拉瓦斯性质或光谱中狄拉克样点的存在有关的特征。此外，详细分析了高对称点附近的衰减率的渐近行为。非弹性中子散射自旋自旋结构因子是按前1 / S阶获得的，并且显示出由质感引起的衰变引起的磁振动力学的不同指纹，如通过衰变和强频谱权重分布而扩大的准粒子峰。

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  • 来源
    《Physical review》 |2016年第1期|014418.1-014418.17|共17页
  • 作者

    P. A. Maksimov; A. L. Chernyshev;

  • 作者单位

    Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;

    Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;

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