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Resonance fluorescence revival in a voltage-controlled semiconductor quantum dot

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arxiv 1710.09732 v1 pith:YQBS5RU7 submitted 2017-10-26 cond-mat.mes-hall

Resonance fluorescence revival in a voltage-controlled semiconductor quantum dot

Antoine Reigue , Aristide Lema\^itre , Carmen Gomez Carbonell , Christian Ulysse , Kamel Merghem , St\'ephane Guilet , Richard Hostein , Valia Voliotis This is my paper
classification cond-mat.mes-hall
keywords quantumdotsfluorescencechargecontrolledresonancesinglevoltage
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We demonstrate systematic resonance fluorescence recovery with near-unity emission efficiency in single quantum dots embedded in a charge-tunable device in a wave-guiding geometry. The quantum dot charge state is controlled by a gate voltage, through carrier tunneling from a close-lying Fermi sea, stabilizing the resonantly photocreated electron-hole pair. The electric field cancels out the charging/discharging mechanisms from nearby traps toward the quantum dots, responsible for the usually observed inhibition of the resonant fluorescence. Fourier transform spectroscopy as a function of the applied voltage shows a strong increase of the coherence time though not reaching the radiative limit. These charge controlled quantum dots act as quasi-perfect deterministic single-photon emitters, with one laser pulse converted into one emitted single photon.

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