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Individual self-assembled Quantum Dots and Quantum Posts are studied underthe influence of a surface acoustic wave. In optical experiments we observe anacoustically induced switching of the occupancy of the nanostructures alongwith an overall increase of the emission intensity. For Quantum Posts,switching occurs continuously from predominantely charged excitons (dissimilarnumber of electrons and holes) to neutral excitons (same number of electronsand holes) and is independent on whether the surface acoustic wave amplitude isincreased or decreased. For quantum dots, switching is non-monotonic and showsa pronounced hysteresis on the amplitude sweep direction. Moreover, emission ofpositively charged and neutral excitons is observed at high surface acousticwave amplitudes. These findings are explained by carrier trapping andlocalization in the thin and disordered two-dimensional wetting layer on top ofwhich Quantum Dots nucleate. This limitation can be overcome for Quantum Postswhere acoustically induced charge transport is highly efficient in a widelateral Matrix-Quantum Well.

Enhanced sequential carrier capture into individual quantum dots and quantum posts controlled by surface acoustic waves