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

TL;DR

This paper theoretically explores how periodic magnetic fields influence the electronic and optical properties of monolayer black phosphorus, revealing tunable anisotropy and spin-splitting effects useful for optoelectronic applications.

Contribution

It introduces a method to modulate electronic anisotropy and optical absorption in phosphorene using magnetic superlattice configurations and external electric fields.

Findings

Distinct energy spectra for different PMS orientations.

Development of spin-splitting energy dispersion due to RSOC.

Bright-to-dark transitions in optical absorption spectrum.

Abstract

We investigate theoretically the effects of modulated periodic perpendicular magnetic fields on the electronic states and optical absorption spectrum in a monolayer black phosphorus (phosphorene). We demonstrate that different phosphorene magnetic superlattice (PMS) orientations can give rise to distinct energy spectra, i.e., tuning the intrinsic electronic anisotropy. The Rashba spin-orbit coupling (RSOC) will develop a spin-splitting energy dispersion in this phosphorene magnetic supperlattice. Anisotropic momentum-dependent carrier distributions along/perpendicular to the magnetic strips are demonstrated, and the manipulations of these exotic properties by tuning superlattice geometry, magnetic field and the RSOC term (via an external electric field) are addressed systematically. Accordingly, we find bright-to-dark transitions in the ground state electron-hole pairs transition rate spectrum and PMS 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.