One-particle spectral properties of the t-J-V model on the triangular lattice near charge order

M. BEJAS,A. GRECO, A. MURAMATSU, AND A. FOUSSATS1

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

The American Physical Society

Año: 2008 vol. 77 p. 75131 - 751141

0163-1829

We study the t-J-V model beyond mean field level at finite doping on the triangular lattice. The Coulombrepulsion V between nearest neighbors brings the system to a charge ordered state for V larger than a criticalvalue Vc. One-particle spectral properties such as self-energy, spectral functions, and the quasiparticle weightare studied near and far from the charge ordered phase. When the system approaches the charge ordered state,charge fluctuations become soft and they strongly influence the system leading to incoherent one-particleexcitations. Possible implications for cobaltates are given.