Energy of the nearest neighbor RVB state by systematic loop expansion

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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 $-0.434473J$.
RevTex-file, 4 PRB pages with 2 eps files

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/28043

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9801234
 http://arxiv.org/abs/cond-mat/9801234

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arXiv