Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2019

Ключевые слова: Cluster perturbation theory, Fermi surface, HTSc, spectral properties, The Hubbard model, The Hubbard-Holstein model

Аннотация: In the framework of the cluster perturbation theory for the 2D Hubbard and Hubbard-Holstein models at low hole doping, we have studied the effect of local and short-range correlations in strongly correlated systems on the anomalous features in the electronic spectrum by investigating the fine structure of quasiparticle bands. Different anomalous features of spectrum are obtained as the result of intrinsic properties of strongly correlated electron and polaron bands in the presence of short-range correlations. Particularly, features similar to the electron-like Fermi-pockets of cuprates at hole doping p ∼ 0.1 are obtained without ad hoc introducing a charge density wave order parameter within the Hubbard model in a unified manner with other known peculiarities of the pseudogap phase like Fermi-arcs, pockets, waterfalls, and kink-like features. The Fermi surface is mainly formed by dispersive quasiparticle bands with large spectral weight, formed by coherent low-energy exications. Within the Hubbard-Holstein model at moderate phonon frequencies, we show that modest values of local electron-phonon interaction are capable of introducing low-energy kink-like features and affecting the Fermi surface by hybridization of the fermionic quasiparticle bands with the Franck-Condon resonances.

Журнал: Journal of Superconductivity and Novel Magnetism

Выпуск журнала: Т. 32, № 7

Номера страниц: 1909-1919

ISSN журнала: 15571939

Издатель: Springer New York LLC

• Kuz'min V. (Kirensky Institute of Physics,Federal Research Center KSC SB RAS)
• Nikolaev S. (Siberian Federal University)
• Ovchinnikov S. (Siberian Federal University)

• Scopus
• Ядро РИНЦ (eLIBRARY.RU)