http://hdl.handle.net/20.500.12128/8415
Title: | Extended Hubbard model in the dimer representation.[Cz.] 2 Dimer Hamiltonian in the large U limit |
Authors: | Grabiec, B. Matlak, Michał |
Keywords: | teorie i modele układów wieloelektronowych; gaz elektronowy; gaz Fermiego; model Hubbarda |
Issue Date: | 2002 |
Citation: | Acta Physica Polonica A, Vol. 101, nr 4 (2002), s. 549-557 |
Abstract: | Using the exact decomposition of the sclattice into a set of interacting dimers (each dimer is described by the extended Hubbard Hamiltonian) and exact solution of the dimer problem (preceding paper) we exactly find the form of the extended Hubbard model in the case of a crystal in the large U limit. We apply a new, nonperturbative approach based on the exact projection procedure onto a dimer subspace occupied by electrons in this limit (it is the only assumption). The resulting Hamiltonian is very complicated and contains a variety of multiple magnetic and nonmagnetic interactions deeply hidden in its original form (site representation). We also present a simplified version of the model to better visualize a mixture of different interactions resulting from this approach. |
URI: | http://hdl.handle.net/20.500.12128/8415 |
ISSN: | 0587-4246 |
Appears in Collections: | Artykuły (WNŚiT) |
File | Description | Size | Format | |
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Grabiec_Extended_Hubbard_model_in_the_dimer_2.pdf | 513,72 kB | Adobe PDF | View/Open |
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