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

Abstract

Individual self-assembled Quantum Dots and Quantum Posts are studied under the influence of a surface acoustic wave. In optical experiments we observe an acoustically induced switching of the occupancy of the nanostructures along with an overall increase of the emission intensity. For Quantum Posts, switching occurs continuously from predominantely charged excitons (dissimilar number of electrons and holes) to neutral excitons (same number of electrons and holes) and is independent on whether the surface acoustic wave amplitude is increased or decreased. For quantum dots, switching is non-monotonic and shows a pronounced hysteresis on the amplitude sweep direction. Moreover, emission of positively charged and neutral excitons is observed at high surface acoustic wave amplitudes. These findings are explained by carrier trapping and localization in the thin and disordered two-dimensional wetting layer on top of which Quantum Dots nucleate. This limitation can be overcome for Quantum Posts where acoustically induced charge transport is highly efficient in a wide lateral Matrix-Quantum Well.

11 pages, 5 figures

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Cited by in corpus (24)

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• Directional and dynamic modulation of the optical emission of an individual GaAs nanowire using surface acoustic waves
• Surface acoustic wave regulated single photon emission from a coupled quantum dot-nanocavity system
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• Multiharmonic frequency-chirped transducers for surface-acoustic-wave optomechanics
• Independent dynamic acousto-mechanical and electrostatic control of individual quantum dots in a LiNbO${}_3$-GaAs hybrid
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• Acoustically modulated optical emission of hexagonal boron nitride layers
• Charge control in laterally coupled double quantum dots
• Direct observation of dynamic surface acoustic wave controlled carrier injection into single quantum posts using phase-resolved optical spectroscopy
• Radio frequency occupancy state control of a single nanowire quantum dot
• The Acoustophotoelectric Effect: Efficient Phonon-Photon-Electron Coupling in Zero-Voltage-Biased 2D SnS${}_2$ for Broadband Photodetection
• Dynamic control of the optical emission from GaN/InGaN nanowire quantum dots by surface acoustic waves
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• Surface acoustic wave controlled charge dynamics in a thin InGaAs quantum well
• Quantum dynamics of optical phonons generated by optical excitation of a quantum dot
• Heterogeneous integration of superconducting thin films and epitaxial semiconductor heterostructures with Lithium Niobate
• Inter-dot coupling and excitation transfer mechanisms of telecommunication band InAs quantum dots at elevated temperatures
• High-dimensional acousto-optoelectric correlation spectroscopy reveals coupled carrier dynamics in polytypic nanowires
• Effect of periodic potential on exciton states in semiconductor carbon nanotubes