Abstract
The generation of surface acoustic waves (SAWs) on semiconductorpiezoelectric substrates, such as GaAs, allows for the application of theSAW strain and piezoelectric fields to manipulate elementary excitations(like carriers, spins, and photons) in low dimensional semiconductornanostructures. The SAW propagating fields, besides inducingcarrier transport, can be used to modulate the optical properties ofnanostructures via the Stark effect induced by the piezoelectric fieldand the bandgap modulation induced by the strain.Here, we propose a new research project focused on the modulationof the optical properties of semiconductor nanostructures using surfaceacoustic waves. Our goal is to use SAWs as a local, non destructiveand precise tool to manipulate and dynamically tune the emissionproperties of nanoscale structures. We describe the methods employedin order to implement this techinque and propose experiments to beperformed in III-V semiconductor nanowires and core/shell colloidalquantum dots. In the former, we show how one dimensional carrieracoustic transport along the nanowire growth direction can be achievedusing SAWs. In the latter, the acoustic modulation is employed to tunethe energy levels of individual nanocrystals. We also discuss how theseexperiments can be used as a platform for a series of carrier and spindynamics studies in different types of nanostructures. (AU)
| Articles published in Agência FAPESP Newsletter about the research grant: |
| More itemsLess items |
| TITULO |
| Articles published in other media outlets ( ): |
| More itemsLess items |
| VEICULO: TITULO (DATA) |
| VEICULO: TITULO (DATA) |