The nearest-neighbor resonating-valence bond state in a Grassmannian form |
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Authors: | Thomas Blum Yonathan Shapir |
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Institution: | (1) Department of Physics and Astronomy, University of Rochester, 14627-0011 Rochester, New York;(2) Department of Physics, The Technion-IIT, 32000 Haifa, Israel |
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Abstract: | The nearest-neighbor resonating-valence bond (NNRVB) state is studied using classical anticommuting (Grassmann) variables. The classical partition function corresponding to the self-overlap of the NNRVB wavefunction is generated from a local (bond) Hamiltonian expressed in terms of four anticommuting variables. It is shown that the one-particle-per-site constraint introduces an interaction term which is a local product of all four variables. Two approaches are applied to study this Hamiltonian: (i) a self-consistent field decoupling scheme and (ii) a systematic perturbation expansion around the unconstrained soluble point. Bounds on the norm of the wavefunction are derived. Extensions to the presence of holes, long-range valence bonds, and the introduction of phase fluctuations which violate the Marshall sign rule and yield aU(1) gauge theory] are discussed. |
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Keywords: | Grassmann Variable Hubbard model Heisenberg antiferromagnet (AF) resonating valence bond (RVB) state |
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