Tuning electrical and optical anisotropy of a monolayer black phosphorus magnetic superlattice

摘要

We investigate theoretically the effects of modulated periodic perpendicularmagnetic fields on the electronic states and optical absorption spectrum in amonolayer black phosphorus (phosphorene). We demonstrate that differentphosphorene magnetic superlattice (PMS) orientations can give rise to distinctenergy spectra, i.e., tuning the intrinsic electronic anisotropy. The Rashbaspin-orbit coupling (RSOC) will develop a spin-splitting energy dispersion inthis phosphorene magnetic supperlattice. Anisotropic momentum-dependent carrierdistributions along/perpendicular to the magnetic strips are demonstrated, andthe manipulations of these exotic properties by tuning superlattice geometry,magnetic field and the RSOC term (via an external electric field) are addressedsystematically. Accordingly, we find bright-to-dark transitions in the groundstate electron-hole pairs transition rate spectrum and PMS orientationdependent anisotropic optical absorption spectrum. This feature offers us apractical way to modulate the electronic anisotropy in phosphorene by magneticsuperlattice configurations and detect these modulation capability by using theoptical technique.