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Nanowire Quantum Dots Tuned to Atomic Resonances
Tech Univ Denmark, DTU Dept Photon Engn, DK-2800 Lyngby, Denmark..
Tech Univ Denmark, DTU Dept Photon Engn, DK-2800 Lyngby, Denmark..
St Petersburg Acad Univ, RAS, St Petersburg 194021, Russia.;ITMO Univ, Kronverkskiy Pr 49, St Petersburg 197101, Russia..
KTH, School of Engineering Sciences (SCI), Applied Physics.
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2018 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 18, no 11, p. 7217-7221Article in journal (Refereed) Published
Abstract [en]

Quantum dots tuned to atomic resonances represent an emerging field of hybrid quantum systems where the advantages of quantum dots and natural atoms can be combined. Embedding quantum dots in nanowires boosts these systems with a set of powerful possibilities, such as precise positioning of the emitters, excellent photon extraction efficiency and direct electrical contacting of quantum dots. Notably, nanowire structures can be grown on silicon substrates, allowing for a straightforward integration with silicon-based photonic devices. In this work we show controlled growth of nanowire-quantum-dot structures on silicon, frequency tuned to atomic transitions. We grow GaAs quantum dots in AlGaAs nanowires with a nearly pure crystal structure and excellent optical properties. We precisely control the dimensions of quantum dots and their position inside nanowires and demonstrate that the emission wavelength can be engineered over the range of at least 30 nm around 765 nm. By applying an external magnetic field, we are able to fine-tune the emission frequency of our nanowire quantum dots to the D-2 transition of Rb-87. We use the Rb transitions to precisely measure the actual spectral line width of the photons emitted from a nanowire quantum dot to be 9.4 +/- 0.7 mu eV, under nonresonant excitation. Our work brings highly desirable functionalities to quantum technologies, enabling, for instance, a realization of a quantum network, based on an arbitrary number of nanowire single-photon sources, all operating at the same frequency of an atomic transition.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 18, no 11, p. 7217-7221
Keywords [en]
Nanowires, quantum dots, hybrid systems, VLS growth, GaAs/AlGaAs
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-240011DOI: 10.1021/acs.nanolett.8b03363ISI: 000451102100076PubMedID: 30336054Scopus ID: 2-s2.0-85055343147OAI: oai:DiVA.org:kth-240011DiVA, id: diva2:1269294
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QC 20181210

Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2018-12-10Bibliographically approved

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Jöns, Klaus D.Zwiller, Val

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