From the artificial atom to the Kondo-Anderson model: orientation dependent magneto-photoluminescence of charged excitons in InAs quantum dots

Abstract

We present a magneto-photoluminescence study on neutral and charged excitons confined to InAs/GaAs quantum dots. Our investigation relies on a confocal microscope that allows arbitrary tuning of the angle between the applied magnetic field and the sample growth axis. First, from experiments on neutral excitons and trions, we extract the in-plane and on-axis components of the Landé tensor for electrons and holes in the s-shell. Then, based on the doubly negatively charged exciton magneto-photoluminescence we show that the p-electron wave function spreads significantly into the GaAs barriers. We also demonstrate that the p-electron g-factor depends on the presence of a hole in the s-shell. The magnetic field dependence of triply negatively charged excitons photoluminescence exhibits several anticrossings, as a result of coupling between the quantum dot electronic states and the wetting layer. Finally, we discuss how the system evolves from a Kondo-Anderson exciton description to the artificial atom model when the orientation of the magnetic field goes from Faraday to Voigt geometry.

References in corpus (4)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Nonlinear dynamics of quantum dot nuclear spins
• Polarization sensitive spectroscopy of charged Quantum Dots
• Lande g-tensor in semiconductor nanostructures

Cited by in corpus (11)

• Excitons in InGaAs Quantum Dots without Electron Wetting Layer States
• Exciton Footprint of Self-assembled AlGaAs Quantum Dots in Core-Shell Nanowires
• Quantum dot self-assembly driven by a surfactant-induced morphological instability
• Correlations between Optical Properties and Voronoi-Cell Area of Quantum Dots
• Observation of coupling between zero- and two-dimensional semiconductor systems based on anomalous diamagnetic effects
• Complex optical signatures from quantum dot nanostructures and behavior in inverted pyramidal recesses
• Charge state control in single InAs/GaAs quantum dots by external electric and magnetic fields
• Magneto-spectroscopy of excited states in charge-tunable GaAs/AlGaAs [111] quantum dots
• Magneto-optical spectroscopy of single charge-tunable InAs/GaAs quantum dots emitting at telecom wavelengths
• Exciton dynamics in GaAs/(Al,Ga)As core-shell nanowires with shell quantum dots
• Fine structure of excitons in InAs quantum dots on GaAs(110) planar layers and nanowire facets