Parkinson, PatrickLloyd-Hughes, JGao, QiangJagadish, ChennupatiJohnston, Michael BHerz, LauraTan, Hark Hoe2015-12-102015-12-101530-6984http://hdl.handle.net/1885/52536The 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.Keywords: Electric charge; Mathematical models; Semiconducting gallium arsenide; Thermal effects; Drude model; Nanowire surface; Time-domain spectroscopy; Nanowires200710.1021/nl071162x2015-12-09