Magneto-optical absorption properties of silicene: Equations of motion method

Abstract

In this study, we explore the magneto-optical response of monolayer silicene subjected to perpendicular electric and magnetic fields by analyzing its optical response functions derived through the equation of motion approach. Both intraband and interband transitions are analyzed in detail. Our results show that the absorption spectrum is highly sensitive to the electron density, which controls the Fermi level and thereby determines the possible optical transitions. At high electron densities, the first interband transition peak shifts to higher energies, while the intraband peaks become more pronounced due to the reduced transition energies. The response also shows strong polarization dependence: left-handed circular polarization enhances absorption, while right-handed polarization suppresses it. A characteristic “half-peak” structure arises from asymmetric Pauli blocking. Magnetic fields effectively modulate peak positions and intensities, whereas electric fields play a lesser role under strong quantization. These findings highlight silicene’s tunability for infrared and terahertz optoelectronic applications.