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Carrier Transport in GaAs Nanowires Using Surface Acoustic Waves

  • A. Hernández-Mínguez (a1), M. Möller (a2), C. Pfüller (a1), S. Breuer (a1), O. Brandt (a1), M. M. de Lima (a2), A. García-Cristóbal (a2), A. Cantarero (a2), L. Geelhaar (a1), H. Riechert (a1) and P. V. Santos (a1)...
Abstract

The oscillating piezoelectric field of a surface acoustic wave (SAW) is employed to transport photoexcited electrons and holes in GaAs nanowires (NWs) transferred to a SAW beam line on a LiNbO3 crystal. We show that carriers generated in the NW by a focused light spot can be acoustically transported to a second location, where they recombine emitting short light pulses. The results presented here demonstrate the high-frequency manipulation of carriers in NWs without the use of electrical contacts, which opens new perspectives for applications in opto-electronic devices operating at GHz frequencies.

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