Аннотация: In many cases the standard perturbation approach appears to be too simple to describe precisely the angle-resolved photoemission spectrum of a strongly correlated electron system. In particular, to describe the momentum asymmetry observed in the photoemission spectra of high- cuprates, a phenomenological approach based on an extremely correlated Fermi-liquid model has been recently introduced. Here we analyze the general structure of the Green's function of quasiparticles in strongly correlated electron systems and stress that it is defined not only by the self-energy of Hubbard quasiparticles but also by a strength operator. The latter leads to an additional odd momentum contribution to the spectral function and alone can explain the observed asymmetry. So, the asymmetry of the angle-resolved photoemission spectra can be a measure of the strength of electron correlations in materials.
Смотреть статью,
Scopus,
WOS,
Для получение полного текста обратитесь в библиотеку
Держатели документа:
Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine
Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Kordyuk, A. A.; Овчинников, Сергей Геннадьевич; Russian Science Foundation [14-12-00061]; National Academy of Sciences of Ukraine [73-02-14]