ENCORE: An Extended Contractor Renormalization algorithm

Details ENCORE: An Extended Contractor Renormalization algorithm ENCORE: An Extended Contractor Renormalization algorithm

2008-05-15

arxiv.org/abs/0805.2290v2

Phys. Rev. E 79, 046712 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevE.79.046712

Contractor renormalization (CORE) is a real-space renormalization-group method to derive effective Hamiltionians for microscopic models. The original CORE method is based on a real-space decomposition of the lattice into small blocks and the effective degrees of freedom on the lattice are tensor products of those on the small blocks. We present an extension of the CORE method that overcomes this restriction. Our generalization allows the application of CORE to derive arbitrary effective models whose Hilbert space is not just a tensor product of local degrees of freedom. The method is especially well suited to search for microscopic models to emulate low-energy exotic models and can guide the design of quantum devices.

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