Dynamical structure factor of the triangular-lattice antiferromagnet
Dynamical structure factor of the triangular-lattice antiferromagnet
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DOI：
10.1103/physrevb.88.094407
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发表时间：
2013-09-05
影响因子：
3.7
通讯作者：
Zhitomirsky, M. E.
中科院分区：
文献类型：
--
作者：
Mourigal, M.;Fuhrman, W. T.;Zhitomirsky, M. E.
我们通过计算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的自旋动力学中的作用。针对自旋 S = 1/2 和 S = 3/2 提供了中子散射强度的明确理论结果。动力学结构因子表现出非常规特征，例如因衰变而变宽的准粒子峰、非洛伦兹线形以及对二磁振子连续体的显着光谱权重重新分布。这种丰富的激发光谱说明了三角晶格反铁磁体的复杂性，并为衰变引起的磁振子动力学的实验观察提供了独特的定性和定量指纹。
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.