GHz bandwidth electro-optics of a single self-assembled quantum dot in a charge-tunable device

Details GHz bandwidth electro-optics of a single self-assembled quantum dot in a charge-tunable device GHz bandwidth electro-optics of a single self-assembled quantum dot in a charge-tunable device

2011-11-25

arxiv.org/abs/1111.5914v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures

Scientific paper

The response of a single InGaAs quantum dot, embedded in a miniaturized charge-tunable device, to an applied GHz bandwidth electrical pulse is investigated via its optical response. Quantum dot response times of 1.0 \pm 0.1 ns are characterized via several different measurement techniques, demonstrating GHz bandwidth electrical control. Furthermore a novel optical detection technique based on resonant electron-hole pair generation in the hybridization region is used to map fully the voltage pulse experienced by the quantum dot, showing in this case a simple exponential rise.

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