Magneto‐optical properties of monolayer MoS2‐SiO2/Si structure measured via terahertz time‐domain spectroscopy

Abstract

AbstractAn experimental study on terahertz (THz) magneto‐optical (MO) properties of monolayer (ML) molybdenum disulfide (MoS2) on SiO2/Si substrate is conducted by using THz time‐domain spectroscopy (TDS) in the presence of the magnetic field in the Faraday geometry at liquid nitrogen temperature of 80 K. The complex longitudinal MO conductivity, σxx(ω), is measured for ML MoS2 in different magnetic fields up to 8 T. The real and imaginary parts of σxx(ω) for ML MoS2 depend strongly on the magnetic field and fit well to the generalized MO Drude‐Smith formula. Through fitting the experimental results with the theoretical formula, the key sample and material parameters for ML MoS2 (e.g., the electron density, the electronic relaxation time, the electronic localization factor) are determined magneto‐optically and their dependence upon the magnetic field is examined. It is shown that the presence of the magnetic field can significantly weaken the effect of optically induced electronic backscattering or localization in ML MoS2. This work demonstrates that the MO measurement on the basis of the THz TDS is a powerful experimental technique for the investigation of atomically thin electronic materials and devices such as ML MoS2 on a substrate.