Superconductivity of Carriers Doped into the Static Charge Density Wave State in 2-Dimensional Square Lattice

TL;DR

This paper investigates how doping carriers into a charge density wave state in a 2D square lattice can induce high-temperature superconductivity, emphasizing the role of long-range Coulomb interactions and correlated hopping.

Contribution

It demonstrates that doped carriers in a CDW state can become superconducting due to correlated hopping, with a preference for extended s-wave symmetry and high critical temperatures.

Findings

Superconductivity emerges in doped CDW states due to correlated hopping.

Extended s-wave pairing is favored in the studied system.

Critical temperature around 100K near half-filling.

Abstract

On the purpose of studying the effect of long-range Coulomb-interaction in strongly correlated electronic systems we bring in as its representative the nearest-neighbor repulsion ($v$) in addition to the on-site repulsion ($u$) and shall investigate the possibility of the superconducting transition of carriers doped into the charge-density wave (CDW) state expected for $v\,>\,u/4$ in 2-dimensional square lattice. We shall see that strongly correlated hopping processes of doped carriers make the systems superconducting. The favored superconducting phase is of extended s-wave symmetry, and $T_{c} \sim$100K is shown to easily be attained near the half-filling.