Magneto-optical transport properties of monolayer phosphorene

TL;DR

This paper investigates the magneto-optical properties of monolayer phosphorene, revealing its tunable optical responses across a wide frequency range and highlighting its potential for novel optical device applications.

Contribution

It provides a detailed theoretical analysis of the band structure and magneto-optical conductivities of monolayer phosphorene under magnetic fields, emphasizing its tunability and anisotropic responses.

Findings

Magneto-optical conductivities are strongly influenced by magnetic fields.

Interband oscillations occur in the 1.5-2 eV frequency range.

Responses can be tuned from microwave to visible frequencies.

Abstract

The electronic properties of monolayer phosphorene are exotic due to its puckered structure and large intrinsic direct band gap. We derive and discuss its band structure in the presence of a perpendicular magnetic field. Further, we evaluate the magneto-optical Hall and longitudinal optical conductivities, as functions of temperature, magnetic field, and Fermi energy, and show that they are strongly influenced by the magnetic field. The imaginary part of the former and the real part of the latter exhibit regular {\it interband} oscillations as functions of the frequency $\omega$ in the range $\hslash\omega\sim 1.5-2$ eV. Strong {\it intraband} responses in the latter and week ones in the former occur at much lower frequencies. The magneto-optical response can be tuned in the microwave-to-terahertz and visible frequency ranges in contrast with a conventional two-dimensional electron gas or graphene in which the response is limited to the terahertz regime. This ability to isolate carriers in an anisotropic structure may make phosphorene a promising candidate for new optical devices.