Elementary excitations for the two-dimensional quantum Heisenberg antiferromagnet

Guanhua Chen, Hong-Qiang Ding, and William A. Goddard, III
Phys. Rev. B 46, 2933 – Published 1 August 1992
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Abstract

The excitation spectrum of the antiferromagnetic spin-1/2 Heisenberg Hamiltonian H=tsumJS^iS^j 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 ωkZ(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.

  • Received 24 January 1992

DOI:https://doi.org/10.1103/PhysRevB.46.2933

©1992 American Physical Society

Authors & Affiliations

Guanhua Chen, Hong-Qiang Ding, and William A. Goddard, III

  • Materials Simulation Center, Beckman Institute, California Institute of Technology, Pasadena, California 91125

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Issue

Vol. 46, Iss. 5 — 1 August 1992

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