Nanoscale Charge Motion in GaAs Nanobars Studied by Terahertz Spectroscopy

H. Nemec, V. Pushakarev, T. Ostatnicky,P. Kuzel

2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)（2023）

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摘要

Terahertz photoconductivity spectra and dynamics of electrons in GaAs nanobars were investigated using time-domain terahertz far-field and near-field spectroscopy. The photoconductivity spectra demonstrate that at low temperatures, band-bending leads to confinement of electrons to a volume smaller than the geometrical dimensions of the nanobars. Furthermore, scanning near-field THz microscopy reveals a that band bending leads to a rapid escape of photogenerated charges away from the photoexcited surface.

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关键词

band-bending,charge carrier mobility,electron dynamics,GaAs/bin,gallium arsenide nanobars,nanoparticles,nanoscale charge motion,near-field spectroscopy,photoexcited surface,photogenerated charges,scanning near-field terahertz microscopy,terahertz photoconductivity spectra,time-domain terahertz far-field spectroscopy

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