Photoluminescence of a single InAs quantum dot molecule under applied electric field

Abstract

We study the electronic coupling between two vertically stacked InAs quantum dots, which are embedded in the center of a n-i-n structure. We use a micro-photoluminescence setup to optically isolate a single quantum dot pair and measure the time-averaged photoluminescence under an applied vertical electric field. We find that field tunable coupling between excited states of the two quantum dots leads to charge transfer from one dot to the other. We model the spectra including simultaneously the field dependent charge transfer and exciton capture rates, and the many-body spectra of the quantum dot molecule for different carrier configurations.

8 pages, 5 figures

References in corpus (3)

• Quantum-Information Processing with Semiconductor Macroatoms
• Few-Particle Effects in Semiconductor Quantum Dots: Observation of Multi-Charged-Excitons
• Optical spectroscopy of single quantum dots at tunable positive, neutral and negative charge states

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• Intrinsic electric field effects on few-particle interactions in coupled GaN quantum dots
• Electric field control and optical signature of entanglement in quantum dot molecules
• Stark effect in a wedge-shaped quantum box
• Single-particle and collective excitations in quantum wires made up of vertically stacked quantum dots: Zero magnetic field
• Some electronic and optical properties of self-assembled quantum dots: asymmetries in a lens domain