Superconductivity in electron-doped arsenene

Abstract

Based on the first-principles density functional theory electronic structure\ncalculation, we investigate the possible phonon-mediated superconductivity in\narsenene, a two-dimensional buckled arsenic atomic sheet, under electron\ndoping. We find that the strong superconducting pairing interaction results\nmainly from the $p_z$-like electrons of arsenic atoms and the $A_1$ phonon mode\naround the $K$ point, and the superconducting transition temperature can be as\nhigh as 30.8 K in the arsenene with 0.2 doped electrons per unit cell and 12\\%\napplied biaxial tensile strain. This transition temperature is about ten times\nhigher than that in the bulk arsenic under high pressure. It is also the\nhighest transition temperature that is predicted for electron-doped\ntwo-dimensional elemental superconductors, including graphene, silicene,\nphosphorene, and borophene.\n