Heisenberg model for the square-planar lattice and fragments. uri icon

abstract

  • Finite-fragment computations for the ground state of the isotropic spin-(1/2 Heisenberg model for the square-planar lattice are made. Both the exact ground-state and the (severe form of the) resonating-valence-bond ansatz are considered and compared. Energy extrapolations to infinite strips and then the infinite lattice are attempted. A novel real-space renormalization for the ground state is also carried out, and finally the possibility of single-soliton excitations is considered. The short-range ansatz is found to give only a modest improvement beyond a simple Nel state and to be unstable to disproportionation into well-separated single spins. 1990 The American Physical Society.

published proceedings

  • Phys Rev B Condens Matter

author list (cited authors)

  • Zivkovic, T. P., Sandleback, B. L., Schmalz, T. G., & Klein, D. J.

citation count

  • 23

complete list of authors

  • Zivkovic, TP||Sandleback, BL||Schmalz, TG||Klein, DJ

publication date

  • February 1990