单层二硫化钼的磁光电导率研究

The study of magneto-optical conductivity of monolayer MoS_(2)

考虑外加磁场导致的量子化朗道能级以及邻近效应诱导产生的交换作用,采用无规相近似(Random-phase approximation,RPA)下的介电函数对单层二硫化钼(Monolayer molybdenum disulfide,ML-MoS_(2))的纵向磁光电导率进行理论研究。探究了磁场、邻近效应诱导产生的交换作用等因素对纵向磁光电导率的影响。在太赫兹(Terahertz,THz)频段,可以看到由导带内电子跃迁所贡献的两个磁光吸收峰。在可见光频段,可以观察到从价带到导带电子跃迁所贡献的多个磁光吸收峰。研究结果表明,邻近效应诱导产生的交换作用和磁场强度对纵向磁光电导率有重要的影响,单层二硫化钼可应用于可见光到太赫兹频段的自旋电子学和谷电子学磁光器件。

The longitudinal magneto-optical conductivity of monolayer molybdenum disulfide(ML-MoS2)has been theoretically investigated under the quantizing Landau levels induced by applied magnetic field and proximity-induced exchange interaction via using the random-phase approximation(RPA)dielectric function approach.The effects of the proximity-induced exchange interaction and magnetic field on the longitudinal magneto-optical conductivity are examined.There are two magneto-optical absorption peaks induced by the transitions processes within the conduction band in Terahertz(THz)frequency range.The inter-band transitions between conduction and valence bands result in a series of magneto-optical absorption peaks in the visible frequency range.The results indicate that the magnetic field and proximity-induced exchange interaction could have important influence on the longitudinal magneto-optical conductivity of MLMoS_(2)and it could be applied in promising magneto-optics devices for spintronics and valleytronics working from visible to THz frequency range.