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Paper detail

Dynamical structure factor of triangular-lattice antiferromagnet

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.

preprint2016arXivOpen access
M. MourigalW. T. FuhrmanA. L. ChernyshevM. E. Zhitomirsky
cond-mat.str-el
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M. MourigalW. T. FuhrmanA. L. ChernyshevM. E. Zhitomirsky

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