Dynamical structure factor of the triangular-lattice antiferromagnet

Article

关键词: HEISENBERG-ANTIFERROMAGNET;    TEMPERATURE-DEPENDENCE;    LIQUID-HE-4;   

DOI  :  10.1103/PhysRevB.88.094407

来源: SCIE

【 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.

【 授权许可】

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