Open AccessРасширенная модель Холстейна-Хаббарда для эпитаксиального графена на металле
Author(s) -
С.Ю. Давыдов
Publication year - 2018
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2018.02.45449.8581
Subject(s) - coulomb , phase diagram , condensed matter physics , physics , charge (physics) , hubbard model , density of states , spin (aerodynamics) , electron , charge density , spin states , phonon , phase (matter) , quantum mechanics , superconductivity , thermodynamics
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.