Charge Transfer Excitons and Possible Exitonic Pairing in the Extended Three Band Hubbard Model
Exact diagonalisations of the extended Hubbard model are performed. In the insulating regime it is shown that the nearest neighbour copper-oxygen repulsion, $V$, leads to Frenkel excitons in the charge transfer gap at values of $V$ of the order of copper-oxygen hybridisation, $t$. In the metallic re...
| Main Authors: | , , |
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| Format: | Journal article |
| Published: |
1995
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