Mutual Coupling of two Semiconductor Quantum Dots via an Optical Nanocavity Mode

We present an experimental and theoretical study of a system consisting of two spatially separated self-assembled InGaAs quantum dots strongly coupled to a single optical nanocavity mode. Due to their different size and compositional profiles, the two quantum dots exhibit markedly different DC Stark...

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Bibliographic Details
Published inarXiv.org
Main Authors Laucht, A, Villas-Bôas, J M, Stobbe, S, Hauke, N, Hofbauer, F, Böhm, G, Lodahl, P, M -C Amann, Kaniber, M, Finley, J J
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.07.2010
Subjects
Emission spectra
Indium gallium arsenides
Mutual coupling
Photoluminescence
Photonic crystals
Physics - Mesoscale and Nanoscale Physics
Quantum dots
Quantum theory
Self-assembly
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Summary:We present an experimental and theoretical study of a system consisting of two spatially separated self-assembled InGaAs quantum dots strongly coupled to a single optical nanocavity mode. Due to their different size and compositional profiles, the two quantum dots exhibit markedly different DC Stark shifts. This allows us to tune them into mutual resonance with each other and a photonic crystal nanocavity mode as a bias voltage is varied. Photoluminescence measurements show a characteristic triple peak during the double anticrossing, which is a clear signature of a coherently coupled system of three quantum states. We fit the entire set of emission spectra of the coupled system to theory and are able to investigate the coupling between the two quantum dots via the cavity mode, and the coupling between the two quantum dots when they are detuned from the cavity mode. We suggest that the resulting quantum V-system may be advantageous since dephasing due to incoherent losses from the cavity mode can be avoided.
ISSN:2331-8422
DOI:10.48550/arxiv.0912.3685