Correlations in Novel Quantum Materials 2022 (CNQM2022)

Emergent bands induced by plasmon excitations in cuprate superconductors

20 Jun 2022, 17:30

2h

2D5 (Max Planck Institut für Festkörperforschung)

Contributed Poster Poster Session

Speaker

Prof. Andr\'es Greco (Facultad de Ciencias Exactas, Ingenier\'{\i}a y Agrimensura and Instituto de F\'{\i}sica Rosario (UNR-CONICET))

Description

The study of charge excitations in cuprate superconductors is an active topic in present days. Recent resonant inelastic x-ray scattering (RIXS) experiments detected low-energy plasmons in electron-doped (e-cuprates) and hole-doped (h-cuprates) cuprates. These plasmon excitations are, in leading order of a $1/N$ approximation, satisfactorily described in the context of the layered $t$-$J$ model with long-range Coulomb interaction. On the basis of this model, and beyond the leading order in $1/N$, the role of plasmons in the electron self-energy and the spectral functions is discussed. As a salient feature, it was found an emergent band (a sharp side band) which was interpreted as the combined effect of correlations and plasmons. The possible role of these findings in ARPES experiments on h- and e-cuprates is also discussed.