Extending the Reach of Strong-Coupling: An Iterative Technique for Hamiltonian Lattice Models

摘要

The authors propose an iterative method for doing lattice strong-coupling-like calculations in a range of medium to weak couplings. The method is a modified Lanczos scheme, with greatly improved convergence properties. The technique is tested on the Mathieu equation and on a Hamiltonian finite-chain XY model, with excellent results. (Atomindex citation 15:025987)