Block-Spin Approach to Electron Correlations
arXiv:cond-mat/9706308 · doi:10.1103/PhysRevB.56.11653
Abstract
We consider an expansion of the ground state wavefunction of quantum lattice many-body systems in a basis whose states are tensor products of block-spin wavefunctions. We demonstrate by applying the method to the antiferromagnetic spin-1/2 chain that by selecting the most important many-body states the technique affords a severe truncation of the Hilbert space while maintaining high accuracy.
17 pages, 3 Postscript figures
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