The oscillating piezoelectric fields accompanying surface acoustic waves are able to transport charge carriers in semiconductor heterostructures. Here, we demonstrate high-frequency (above 1 GHz) acoustic charge transport in GaAs-based nanowires deposited on a piezoelectric substrate. The short wavelength of the acoustic modulation, smaller than the length of the nanowire, allows the trapping of photo-generated electrons and holes at the spatially separated energy minima and maxima of conduction and valence bands, respectively, and their transport along the nanowire with a well defined acoustic velocity towards indium-doped recombination centers.
- acoustic charge transport
- GaAs nanowire
- surface acoustic waves
Büyükköse, S., Hernandez-Minguez, A., Vratzov, B., Somaschini, C., Geelhaar, L., Riechert, H., ... Santos, P. V. (2014). High-frequency acoustic charge transport in GaAs nanowires. Nanotechnology, 25(13), 135204. https://doi.org/10.1088/0957-4484/25/13/135204