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arXiv 1306.1231cond-mat.str-el
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三角晶格反铁磁体的动力学结构因子

Dynamical structure factor of triangular-lattice antiferromagnet

M. Mourigal, W. T. Fuhrman, A. L. Chernyshev, M. E. Zhitomirsky

摘要:

通过计算三角晶格海森堡反铁磁体的自旋波理论中的动力学结构因子,阐明了磁振子相互作用和自发衰变在三角晶格海森堡反铁磁体自旋动力学中的作用.给出了自旋S = 1/2和S = 3/2时中子散射强度的显式理论结果。的动力学结构因子表现出非常规的功能,如准粒子峰加宽的衰变,非洛伦兹线型,和显着的光谱重量重新分配的两个磁振子连续。这种丰富的激发光谱说明了三角晶格反铁磁体的复杂性,并提供了独特的定性和定量的实验观察的指纹衰变引起的磁振子动力学。

英文摘要:

We elucidate the role of magnon interaction and spontaneous decays in the spin dynamics of the triangular-lattice Heisenberg antiferromagnet by calculating its dynamical structure factor within the spin-wave theory. Explicit theoretical results for neutron-scattering intensity are provided for spins S=1/2 and S=3/2. The dynamical structure factor exhibits unconventional features such as quasiparticle peaks broadened by decays, non-Lorentzian lineshapes, and significant spectral weight redistribution to the two-magnon continuum. This rich excitation spectrum illustrates the complexity of the triangular-lattice antiferromagnet and provides distinctive qualitative and quantitative fingerprints for experimental observation of decay-induced magnon dynamics.

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