Dynamic vibronic coupling in InGaAs quantum dots [Invited]

Ultralong dephasing time in InGaAs quantum dots.

We measure a dephasing time of several hundred picoseconds at low temperature in the ground-state transition of strongly confined InGaAs quantum dots, using a highly sensitive four-wave mixing technique. Between 7 and 100 K the polarization decay has two distinct components resulting in a non-Lorentzian line shape with a lifetime-limited zero-phonon line and a broadband from elastic exciton-aco...

InAs Quantum Dots in Symmetric InGaAs/GaAs Quantum Wells

The self-assembled InAs quantum dots (QDs) are the subject of substantial interest during last fifteen years due to both fundamental scientific and application reasons. In these systems, the strong localization of an electronic wave function leads to an atomic-like electronic density of states and permits to realize the novel and improved photonic and electronic devices. Microlectronic and opto...

Coupling of guided Surface Plasmon Polaritons to proximal self-assembled InGaAs Quantum Dots

We present investigations of the propagation length of guided surface plasmon polaritons along Au waveguides on GaAs and their coupling to near surface InGaAs self-assembled quantum dots. Our results reveal surface plasmon propagation lengths ranging from 13.4 ± 1.7 μm to 27.5 ± 1.5 μm as the width of the waveguide increases from 2-5 μm. Experiments performed on active structures containing nea...

Capture and release of carriers in InGaAs/GaAs quantum dots

We observe the ultrafast capture and release of charge carriers in InGaAs/GaAs quantum dots (QDs) at room-temperature with time-resolved terahertz spectroscopy. For excitation into the barrier states, a decay of the photoinduced conductivity, due to capture of carriers into the nonconducting QD states is observed. The increase of the decay time constant with increasing pump fluence is attribute...

Size dependence of electron spin dephasing in InGaAs quantum dots