Abstract
Spin-wave theory is successfully applied to study the ground state of the quantum XY Hamiltonian. It is found that a judicious choice of the quantized spin axis removes difficulties of previous applications. Results for the simplest one-, two-, and three-dimensional lattices are shown to compare favorably with either exact or other approximate calculations.
- Received 4 June 1987
DOI:https://doi.org/10.1103/PhysRevB.36.8707
©1987 American Physical Society
