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We report the all-electrical control over cavity-emitter systems, consisting in Stark-tunable quantum dots embedded in mechanically reconfigurable photonic crystal membranes. Purcell-effect from a single dot is demonstrated at distinct wavelengths.
We present a device for the spectral reconfiguration of a two-dimensional photonic crystal cavity (PCC) based on parallel semiconductor membranes. The mechanical motion of the slabs introduces a variation in the effective refractive index of the coupled waveguides where the photonic crystal is etched resulting in a shift of the free-space wavelength. Using an integrated electrostatic actuator we demonstrated...
Two-dimensional coherent spectroscopy on a series of quantum dot samples with different morphology reveals that biexciton binding is independent of the details of confinement in InAs dots, in contrast to the behavior in GaAs dots.
Multi-particle correlations are investigated in an InAs quantum dot ensemble using 2D Fourier-transform spectroscopy. Signatures of trions and a fifth-order contribution from the biexciton are observed by varying the excitation polarization and density.
Coherence decay times of and between fine-structure states is obtained from an InAs quantum dot ensemble using optical 2D Fourier-transform spectroscopy. This technique allows us to investigate properties of QDs within the ensemble.
Time-resolved experiments are performed on single quantum dots in bulk material and photonic crystal diodes. These studies reveal that the cavity mode can be pumped by a broad emission originating from the presence of carriers in the wetting layer.
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