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Information × Registration Number 2111U001226, Article popup.category Thesis Title popup.author popup.publication 01-01-2011 popup.source_user Сумський державний університет popup.source http://essuir.sumdu.edu.ua/handle/123456789/20658 popup.publisher Sumy State University Description Using a positive semidefinite operator technique we deduced exact ground states for a modified diamond chain described by a non-integrable Hubbard model with on-site repulsion. Our results are valid for arbitrary length of the chain and strength of the Hubbard interaction. For the analyzed quasi 1D chain structure we found that two flat bands are present in the bare band structure of the system, both for zero and for a fixed value of magnetic field. We obtained ground states of nonmagnetic and ferromagnetic insulator type and studied their physical properties. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20658 popup.nrat_date 2025-05-12 Close