Ultrafast carrier capture dynamics in InGaAs∕GaAs quantum wires
作者： DG Cooke , FA Hegmann , Yu I Mazur , Zh M Wang , W Black
DOI: 10.1063/1.2831024
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摘要: We use time-resolved terahertz-pulse spectroscopy to study the ultrafast carrier dynamics in InGaAs∕GaAs (311)A quantum wires. Anisotropy photoconductive is observed when aligning terahertz probe polarization parallel versus perpendicular wire direction. The origin of this anisotropy capture into localized quantum-wire states from delocalized wetting layer or barrier regions over time scales 6to30ps. efficiency found be strongly temperature dependent, with thermal emission dominating above 125K, while state-filling effects within wires influence rate below 125K. Transient reveals a Drude-like conductivity.
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