Anisotropic properties in phosphorene modulated by periodic potential in arbitrary direction
We investigate theoretically the effects of modulated periodic potential on the electronic states and optical absorption spectrum in a monolayer black phosphorus (phosphorene). We demonstrate that different strength and orientations of phosphorene potential superlattice can give rise to distinct energy spectra, i.e., tuning the intrinsic electronic anisotropy. Momentum-dependent energy and effective mass along the two orthogonal wave vector of these exotic electronic properties by tuning superlattice geometry are addressed systematically. Accordingly, orientation dependent anisotropic optical absorption spectrum. This feature offers us a practical way to modulate the electronic anisotropy in phosphorene by magnetic superlattice configurations and detect these modulation capability by using the optical technique.