Abstract
We report the formation and optical properties of site-controlled InAs/GaAs quantum dots (QDs) embedded in GaAs nanowires (NWs) by selective metalorganic chemical vapor deposition for application to single photon sources. InAs/GaAs QD-in-NWs with various InAs thicknesses are realized on patterned GaAs(111)B substrates in the form of InAs/GaAs heterostructures and identified by structural analyses using scanning transmission electron microscopy and photoluminescence characterization. Sharp excitonic emission peaks at 10 K from single QD-in-NWs with the narrowest exciton linewidth of 87 μeV are observed. Light emission from the single QD-in-NW shows photon antibunching which evidences single photon emission from high-quality QD-in-NWs.
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Acknowledgments
This work is supported by the Special Coordination Funds for Promoting Science and Technology and Funding Program for World-Leading Innovative R&D on Science Technology. The authors would like to acknowledge Dr. T. Ishida, Ms. Y. Takayama and Prof. M. Fujita for TEM analyses of fabricated InAs/GaAs QD-in-NWs.
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Tatebayashi, J., Ota, Y., Karunathillake, D. et al. Formation of a single In(Ga)As/GaAs quantum dot embedded in a site-controlled GaAs nanowire by metalorganic chemical vapor deposition for application to single photon sources. MRS Online Proceedings Library 1439, 115–119 (2012). https://doi.org/10.1557/opl.2012.912
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DOI: https://doi.org/10.1557/opl.2012.912