The carrier transport mechanism of layered molybdenum disulfide (MoS2) is studied by terahertz time-domain spectroscopy. The sheet conductivity and the change of sheet conductivity of layered MoS2 under different pump excitations is studied. The carrier mobility is obtained by analyzing the optical conductivity with the Drude and Drude–Smith models. The carrier dynamics of layered MoS2 is investigated by an optical pump-terahertz probe. It was found that multilayer MoS2 exhibits a higher optical conductivity and mobility than monolayer MoS2, especially under pump excitation.
We report on terahertz (THz) emission from a single layer ferromagnet which involves the generation of backflow nonthermal charge current from the ferromagnet/dielectric interface by femtosecond laser excitation and subsequent conversion of the charge current to a transverse transient charge current via the anomalous Hall effect (AHE), thereby generating the THz radiation. The THz emission can be either enhanced or suppressed, or even the polarity can be reversed by introducing a magnetization gradient in the thickness direction of the ferromagnet. The emission can also be enhanced using a synthetic antiferromagnet (SAF) via the same AHE mechanism. In addition, we demonstrate by both simulation and experiment that the THz emission provides a powerful tool to probe the magnetization reversal process of individual ferromagnetic layers in the SAF structure – an important building block for all types of spintronic devices.
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