Theoretical study of the ground-state property of the two-dimensional Heisenberg antiferromagnet on a triangular lattice

Within the Tyablikov's theoretical framework, the ground-state property of the two-dimensional antiferromagnetic Heisenberg model on a triangular lattice is studied. Our results show that the sublattice magnetization is M = 0.241 and the ground-state energy per bond is E g / NZJ = -0.166, which are in agreement with the numerical simulations.