Magnetoelectronic properties of multilayer black phosphorus

Abstract

We examine the electronic properties of two-dimensional electron gas in black phosphorus multilayers in the presence of a perpendicular magnetic field, highlighting the role of in-plane anisotropy on various experimental quantities such as ac magnetoconductivity, screening, and magnetoplasmons. We find that resonant structures in the ac conductivity exhibits a redshift with increasing doping due to interband coupling $\ensuremath{\gamma}$. This arises from an extra correction term in the Landau energy spectrum proportional to ${n}^{2}{\ensuremath{\gamma}}^{2}$ $(n$ is Landau index), up to second order in $\ensuremath{\gamma}$. We found also that Coulomb interaction leads to highly anisotropic magnetoexcitons.