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• W2996323430 abstract "Semiconductor interfaces are the backbone of modern optoelectronic devices. In terahertz (THz) science, the narrow region of an interface is crucial in the emission process. However, reports on the direct correlation of THz emission with local interface properties remain scarce owing to the inherent difficulty of using the same sample for nanoscale and macroscale studies. In this study, we combined scanning tunneling microscopy/spectroscopy (STM/STS) and THz emission spectroscopy to study the interface between a highly n+-doped and undoped gallium arsenide (GaAs). Using STS, we identify a carrier density of 1×1015 cm−3 in the low-temperature-grown GaAs (LT-GaAs) layer, which we used to visualize the energy band diagram at the interface and the surface of LT-GaAs. THz emission intensity is higher in the LT-GaAs/n+-GaAs structures relative to semi-insulating GaAs owing to the high electric field at the interface regardless of the LT-GaAs layer thickness. Pump fluence dependence of THz showed that the thinner LT-GaAs layers saturate at lower pump fluence compared to thicker LT-GaAs and SI-GaAs. This behavior is explained by the built-in field screening by the photogenerated carriers and the free carriers from the n+-GaAs to the LT-GaAs. Our results demonstrate the utility of STM/STS to the design of semiconductor-based THz emitters." @default.
• W2996323430 created "2019-12-26" @default.
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• W2996323430 date "2019-12-19" @default.
• W2996323430 modified "2023-10-16" @default.
• W2996323430 title "Atomically-resolved interface imaging and terahertz emission measurements of gallium arsenide epilayers" @default.
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• W2996323430 doi "https://doi.org/10.1063/1.5118815" @default.
• W2996323430 hasPublicationYear "2019" @default.
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