We have studied the conductance anisotropy of bilayer black phosphorene under chemical potential or external electric fields based on the non-equilibrium Green's function method. The results have shown that the chemical potential has a huge impact on the direction and magnitude of the conductance anisotropy of bilayer black phosphorene, which beyond those of monolayer. In addition, it is found that the interlayer coupling enhances the conductance anisotropy on the valence band maximum. Particularly, the conductance anisotropy can be greatly modulated by external electric field, and the direction of the maximum and minimum conductance can be even reversed by external electric field. The controllability between the interlayer coupling and the conductance anisotropy with external field is of interest to the field of nano-electronics and have some technical promise.

我们基于非平衡格林函数法研究了在化学势或外部电场作用下双层黑色磷的电导各向异性。结果表明，化学势对双层黑色磷光体的电导各向异性的方向和大小具有极大的影响，其方向和幅度超出了单层。另外，发现层间耦合增强了价带最大值上的电导各向异性。特别地，电导率各向异性可以被外部电场极大地调节，并且最大电导率和最小电导率的方向甚至可以被外部电场反转。