Elementary excitations for the two-dimensional quantum Heisenberg antiferromagnet.
G. Chen, H.-Q. Ding, William A. Goddard III
1992Phys. Rev. B, 46(5), 2933–293818cited
Abstract
The excitation spectrum of the antiferromagnetic spin-1/2 Heisenberg Hamiltonian H=tsumJSj on L×L lattices is evaluated by a projector quantum Monte Carlo method. These results suggest that the exact spectrum for the finite lattice is ωZ(L)ωkSW, for all k, where ωkSW=4JS 1-γk2 with γk=(coskx+cosky)/2 is from linear-spin-wave theory. We find Z(L)=ZE+B/L3, leading to ZE=1.21±0.03 for L=. A comparison with experiments on La2CuO4 is discussed. © 1992 The American Physical Society.
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Chen, G., Ding, H., & III, W. A. G. (1992). Elementary excitations for the two-dimensional quantum Heisenberg antiferromagnet.. *Phys. Rev. B*, *46*(5), 2933–2938. https://doi.org/10.1103/PhysRevB.46.2933