Abstract
A model that combines the extended Hubbard model involving intra-atomic and interatomic Coulomb repulsion and the Holstein model describing the interaction of a band electron with an Einstein phonon is proposed. Three regions of the phase diagram are considered. The regions correspond to the states of spin- and charge-density waves and the state uniform in spin and charge. Numerical estimations for the Rh, Ir, and Pt substrates show that Coulomb interaction plays a leading part, making possible transitions from the uniform state to the states of spin- and charge-density waves.
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Original Russian Text © S.Yu. Davydov, 2018, published in Fizika i Tekhnika Poluprovodnikov, 2018, Vol. 52, No. 2, pp. 238–242.
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Davydov, S.Y. On the Extended Holstein–Hubbard Model for Epitaxial Graphene on Metal. Semiconductors 52, 226–230 (2018). https://doi.org/10.1134/S1063782618020033
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DOI: https://doi.org/10.1134/S1063782618020033