Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-01-22
Physics
Condensed Matter
Strongly Correlated Electrons
RevTex-file, 4 PRB pages with 2 eps files
Scientific paper
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 $-0.434473J$.
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