Spin-wave excitation spectra and spectral weights in square lattice antiferromagnets

Note

关键词: 2-DIMENSIONAL HEISENBERG-ANTIFERROMAGNET;    ZERO-TEMPERATURE;   

DOI  :  10.1103/PhysRevB.52.R15695

来源: SCIE

【 摘 要 】

Using a recently developed method for calculating series expansions of the excitation spectra of quantum lattice models, we obtain the spin-wave spectra for square lattice, S=1/2 Heisenberg-Ising antiferromagnets. The calculated spin-wave spectrum for the Heisenberg model is close to but noticeably different from a uniformly renormalized classical (large-S) spectrum with the renormalization for the spin-wave velocity of approximately 1.18. The relative weights of the single-magnon and multiple-magnon contributions to neutron-scattering spectra are obtained for wave vectors throughout the Brillouin zone.

【 授权许可】

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