Energy of the nearest neighbor RVB state by systematic loop expansion
Strongly Correlated Electrons
2007-05-23 v2
Abstract
We present an approximation scheme for the calculation of the norm and energy of the nearest-neighbor-RVB state for the Heisenberg antiferromagnet on the 2D square lattice. The approximation leads to a systematic expansion of norm and energy, with the `expansion parameter' being the maximum length of loops taken into account in the calculation of energy and norm. The expansion converges well, the best estimate for the ground state energy/site is .
Keywords
Cite
@article{arxiv.cond-mat/9801234,
title = {Energy of the nearest neighbor RVB state by systematic loop expansion},
author = {Robert Eder},
journal= {arXiv preprint arXiv:cond-mat/9801234},
year = {2007}
}
Comments
RevTex-file, 4 PRB pages with 2 eps files