Abstract
A multichain mean-field theory is developed and applied to a two-dimensional system of weakly coupled Heisenberg chains. The environment of a chain is modeled by a number of neighboring chains , , with the edge chains coupled to a staggered field. Using a quantum Monte Carlo method, the effective -chain Hamiltonian is solved self-consistently for up to . The results are compared with simulation results for the original Hamiltonian on large rectangular lattices. Both methods show that the staggered magnetization for small interchain couplings behaves as enhanced by a multiplicative logarithmic correction.
- Received 16 April 1999
DOI:https://doi.org/10.1103/PhysRevLett.83.3069
©1999 American Physical Society