Magneto‐optical properties of monolayer MoS2‐SiO2/Si structure measured via terahertz time‐domain spectroscopy. Issue 1 (17th October 2020)

• Record Type: Journal Article
• Authors: Wen, Hua; Xu, Wen; Wang, Chao; Song, Dan; Mei, Hongying; Zhang, Jie; Ding, Lan
• Is Part Of: Nano select. Volume 2:Issue 1(2021)
• Page Start: 90
• Page End: 98
• Publication Date: 2020-10-17
• Subjects: magneto‐optical properties -- monolayer molybdenum disulfide -- terahertz time‐domain spectroscopy; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.5
• DOI: 10.1002/nano.202000138
• Languages: English
• ISSNs: 2688-4011

Abstract

Abstract: An 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, σ xx ( ω ), is measured for ML MoS2 in different magnetic fields up to 8 T. The real and imaginary parts of σ xx ( 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. Abstract : THz magneto‐optical (MO) measurement by using THz time‐domain spectroscopy in Faraday geometry. Fitting of the experimental results with the MO Drude‐Smith formula for complex longitudinal MO conductivity in ML MoS2 . Key sample parameters determined magneto‐optically. Dependence of the sample parameters upon the magnetic field. Reduction of optically induced electronic localization effect in ML MoS2 by the presence of the magnetic field.