Electrical control of spontaneous emission and strong coupling for a single quantum dot

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  • 16 October 2008
Abstract
By tailoring the vacuum field using cavities or photonic crystals spontaneous emission can be modified or even become reversible. For quantum dots in photonic crystal cavities such cavity QED effects are pronounced and single dot devices like mirrors and phase shifters have recently been demonstrated. All dot-cavity devices require that the emitter and cavity mode are tuned into resonance. Until now, inconvenient and slow methods like temperature variation or inert-gas condensation have been employed. Here, we show how the dot-cavity coupling can be tuned in electrically contacted single dot photonic crystal nanocavities. Our results demonstrate that the emission dynamics can be electrically controlled with a Purcell factor >=7. For high-Q cavities we observe strong coupling with vacuum Rabi splittings of 0.130 meV, representing a voltage switchable quantum optical non-linearity. Our results pave the way towards on-chip dot based nano-photonic devices that can be integrated with passive optical components.

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