Giant conductance anisotropy in black phosphorene tuned by external electric field

Abstract

Based on the non-equilibrium Green’s function method, the conductance anisotropy of black phosphorene has been studied under chemical potential and/or external electric field. The direction and magnitude of the conductance anisotropy strongly depend on the chemical potential, which are in good agreement with experimental observations. Furthermore, the magnitude of conductance anisotropy can be largely modulated by external electric field, which is one order of magnitude larger than previously reported. The directions of the maximum and minimum conductance can be reversed by external electric field, which shows that the former jumps from 24° to 90° and the latter jumps from 90° to 0° respectively. The results are fundamentally interesting and technologically promising in nano-electronics.