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Information × Registration Number 2112U000659, Article popup.category Стаття Title popup.author popup.publication 01-01-2012 popup.source_user Сумський державний університет popup.source http://essuir.sumdu.edu.ua/handle/123456789/24886 popup.publisher Видавництво СумДУ 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 parameter space region of the 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/123456789/24886 popup.nrat_date 2025-03-24 Close