Quantum Monte Carlo calculation of the long-range order in the Heisenberg antiferromagnet
- 1 April 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (13), 7229-7236
- https://doi.org/10.1103/physrevb.45.7229
Abstract
A Green’s-function Monte Carlo (GFMC) method is used to compute the staggered magnetization in the two-dimensional, spin-1/2 Heisenberg antiferromagnet on L×L square lattices, up to L=12. Unlike previous GFMC calculations, the present method, which uses the forward-walking algorithm is unbiased and projects out the exact, rotationally invariant ground state. These calculations provide confirmation of the existence of long-range antiferromagnetic order in the ground state. A known relationship between and the leading finite-size correction, coupled with high-precision ground-state-energy calculations, is used to reduce the error in extrapolating to the thermodynamic limit. The data extrapolate to =0.3075±0.0025, only slightly different from the spin-wave-theory result, 0.3034. Several perfect singlet trial wave functions used to reduce the statistical error are discussed. A possible explanation as to why exact-diagonalization extrapolations tend to yield low values of is presented.
Keywords
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