Superconducting critical temperature of hole doped blue phosphorene

Abstract

We theoretically explore the superconducting critical temperature of hole doped blue phosphorene. Implementing the density functional theory calculations, we show that for the hole doped blue phosphorene, the isotropic superconducting state is induced owing to the quite strong electron-phonon coupling. The theory is based on the Migdal-Eliashberg formalism and the critical temperature is obtained through set-of-equations, self-consistency. In addition, we include a vertex correction diagram to the Migdal-Eliashberg formalism. The inclusion of the vertex correction beyond the Migdal-Eliashberg formalism changes the $T_c$ about $\pm20$K, depending on the level of the doping. Our accurate numerical results show that the superconducting critical temperature is still quite high, even in the cases that the vertex correction is implemented.