Publication
Physical Review B
Paper

Exact diagonalization of finite frustrated spin-(1/2 Heisenberg models

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Abstract

We have studied the spectrum of low-spin eigenstates of a spin-(1/2 Heisenberg model on 4×4 square lattices with up to third-neighbor antiferromagnetic exchange interactions. We have computed the staggered susceptibility, spin-spin correlation function, and the overlap of the exact ground state with various variational spin-density-wave ordered states as well as with the equal-amplitude, nearest-neighbor resonating-valence-bond state (which is the prototypical short-ranged RVB state). We find evidence for a complicated phase diagram with a region in which a short-ranged RVB state may be the ground state. © 1990 The American Physical Society.

Date

01 Mar 1990

Publication

Physical Review B

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