Asymmetric doping dependence of superconductivity between hole- and electron-doped triangular-lattice superconductors

TL;DR

This study uses a kinetic-energy-driven framework to analyze how superconductivity varies asymmetrically with doping in hole- and electron-doped triangular-lattice superconductors, revealing differences in doping range and maximum transition temperatures.

Contribution

It provides a theoretical explanation for the asymmetric doping dependence of superconductivity in triangular-lattice systems, highlighting a potential universal feature of doped Mott insulators.

Findings

Superconductivity exhibits a dome-shaped doping dependence in both cases.

Hole-doped superconductors have a wider doping range for superconductivity.

Electron-doped superconductors have a lower maximum transition temperature.

Abstract

Within the framework of kinetic-energy-driven superconductivity, the asymmetric doping dependence of superconductivity between the hole- and electron-doped triangular-lattice superconductors has been studied. It is shown that although the superconducting transition temperature has a dome-shaped doping dependence for both the hole- and electron-doped triangular-lattice superconductors, superconductivity appears over a wide doping of range in the hole-doped case, while it only exists in a narrow range of the doping in the electron-doped side. Moreover, the maximum superconducting transition temperature around the optimal doping in the electron-doped triangular-lattice superconductors is lower than that of the hole-doped counterparts. The theory also shows that the asymmetric doping dependence of superconductivity between the hole- and electron-doped cases may be a common feature for a doped Mott insulator.