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

Jonathan H. Prechtel, Paul A. Dalgarno, Robert H. Hadfield, Jamie McFarlane, Antonio Badolato, Pierre M. Petroff, Richard J. Warburton

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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 +/- 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. (C) 2012 American Institute of Physics. [doi:10.1063/1.3687375]

Original languageEnglish
Article number043112
Number of pages7
JournalJournal of Applied Physics
Issue number4
Publication statusPublished - 15 Feb 2012

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