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Gigahertz bandwidth electrical control over a dark exciton-based memory bit in a single quantum dot

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8 Author(s)
McFarlane, J. ; School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom ; Dalgarno, P.A. ; Gerardot, B.D. ; Hadfield, R.H.
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An optical write-store-read process is demonstrated in a single InGaAs quantum dot within a charge-tunable device. A single dark exciton is created by nongeminate optical excitation allowing a dark exciton-based memory bit to be stored for over ∼1 μs. Read-out is performed with a gigahertz bandwidth electrical pulse, forcing an electron spin-flip followed by recombination as a bright neutral exciton, or by charging with an additional electron followed by a recombination as a negative trion. These processes have been used to determine accurately the dark exciton spin-flip lifetime as it varies with static electric field.

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Applied Physics Letters  (Volume:94 ,  Issue: 9 )