To investigate the coexistence of superconductivity and charge density wave (CDW) in a correlated regime, we employ the Green's functions formalism, as well as the Hubbard-I approximation, as a way to introduce the correlations into the problem, in the form of a repulsive Coulomb interaction U. In addition, we investigate the effects of second-nearest neighbor hopping t1 on a pure CDW state. The analysis of the results show that, for small values of t1, both CDW and superconducting gaps compete for the same region on the Fermi surface. The increase of t1 decreases the competition and may lead the system to a coexistence regime. Effects of temperature in the coexistence regime, are also investigated.
@article{arxiv.2601.06326,
title = {Coexistence of superconductivity and charge density wave in a correlated regime},
author = {E. J. Calegari and L. C. Prauchner and A. C. Lausmann and S. G. Magalhaes},
journal= {arXiv preprint arXiv:2601.06326},
year = {2026}
}