Transient terahertz conductivity of GaAs nanowires

The time-resolved conductivity of isolated GaAs nanowires is investigated by optical-pump terahertz-probe time-domain spectroscopy. The electronic response exhibits a pronounced surface plasmon mode that forms within 300 fs before decaying within 10 ps as a result of charge trapping at the nanowire...

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Bibliographic Details
Main Authors: Parkinson, P, Lloyd-Hughes, J, Gao, Q, Tan, H, Jagadish, C, Johnston, M, Herz, L
Format: Journal article
Language:English
Published: 2007
Description
Summary:The time-resolved conductivity of isolated GaAs nanowires is investigated by optical-pump terahertz-probe time-domain spectroscopy. The electronic response exhibits a pronounced surface plasmon mode that forms within 300 fs before decaying within 10 ps as a result of charge trapping at the nanowire surface. The mobility is extracted using the Drude model for a plasmon and found to be remarkably high, being roughly one-third of that typical for bulk GaAs at room temperature. © 2007 American Chemical Society.