Open AccessMagneto‐optical properties of monolayer MoS 2 ‐SiO 2 /Si structure measured via terahertz time‐domain spectroscopy
Author(s) -
Wen Hua,
Xu Wen,
Wang Chao,
Song Dan,
Mei Hongying,
Zhang Jie,
Ding Lan
Publication year - 2021
Publication title -
nano select
Language(s) - English
Resource type - Journals
ISSN - 2688-4011
DOI - 10.1002/nano.202000138
Subject(s) - terahertz radiation , monolayer , magnetic field , materials science , spectroscopy , substrate (aquarium) , drude model , analytical chemistry (journal) , optical conductivity , condensed matter physics , terahertz time domain spectroscopy , terahertz spectroscopy and technology , chemistry , optoelectronics , physics , nanotechnology , oceanography , geology , quantum mechanics , chromatography
An experimental study on terahertz (THz) magneto‐optical (MO) properties of monolayer (ML) molybdenum disulfide (MoS 2 ) on SiO 2 /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 MoS 2 in different magnetic fields up to 8 T. The real and imaginary parts of σ xx ( ω ) for ML MoS 2 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 MoS 2 (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 MoS 2 . 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 MoS 2 on a substrate.