Publications (15)
Large-N expansion based on the Hubbard-operator path integral representation and its application to the model
Adriana Foussats, Andres Greco
In the present work we have developed a large-N expansion for the model based on the path integral formulation for Hubbard-operators. Our large-N expansion formulation contai…
Strong particle-hole asymmetry of charge instabilities in doped Mott insulators
Matias Bejas, Andres Greco, Hiroyuki Yamase
We study possible charge instabilities in doped Mott insulators by employing the two-dimensional t-J model with a positive value of the next nearest-neighbor hopping integral t' on…
Competition between spin-induced charge instabilities in underdoped cuprates
Roland Zeyher, Andres Greco
We study the static charge correlation function in an one-band model on a square lattice. The Hamiltonian consist of effective hoppings of the electrons between the lattice sites a…
Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering
Abhishek Nag, M. Zhu, Matias Bejas +11
High Tc superconductors show a rich variety of phases associated with their charge degrees of freedom. Valence charges can give rise to charge ordering or acoustic plasmons in thes…
Charge-Density-Excitation Spectrum in the t-t'-J-V Model
Andres Greco, Hiroyuki Yamase, Matias Bejas
We study the density-density correlation function in a large-N scheme of the t-t'-J-V model. When the nearest-neighbor Coulomb interaction V is zero, our model exhibits phase separ…
Pseudogap in cuprates driven by d-wave flux-phase order proximity effects: A theoretical analysis from Raman and ARPES experiments
Andres Greco, Matias Bejas
One of the puzzling characteristics of the pseudogap phase of high- cuprates is the nodal-antinodal dichotomy. While the nodal quasiparticles have a Fermi liquid behaviour, th…