A detailed temporal analysis of the spectral diffusion phenomenon in single photon emitting InGaN/GaN quantum dots (QDs) is performed via measurements of both time-varying emission spectra and single photon emission intensity autocorrelation times. Excitation dependent phenomena are investigated via the optical excitation of carriers into the GaN barrier material and also directly into InGaN. Excitation into InGaN reveals that the fastest environmental fluctuations occur on timescales as long as a few hundreds of nanoseconds: an order of magnitude longer than previously measured in GaN QDs. Such long time scales may in future allow for the generation of indistinguishable photons in spite of the fact that the experimentally measured linewidths are broad.
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18 March 2019
Research Article|
March 22 2019
Spectral diffusion time scales in InGaN/GaN quantum dots
Kang Gao
;
Kang Gao
1
Institute for Nano Quantum Information Electronics, The University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Helen Springbett
;
Helen Springbett
2
Department of Materials Science and Metallurgy, The University of Cambridge
, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
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Tongtong Zhu
;
Tongtong Zhu
2
Department of Materials Science and Metallurgy, The University of Cambridge
, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
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Rachel A. Oliver
;
Rachel A. Oliver
2
Department of Materials Science and Metallurgy, The University of Cambridge
, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
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Yasuhiko Arakawa;
Yasuhiko Arakawa
1
Institute for Nano Quantum Information Electronics, The University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Mark J. Holmes
Mark J. Holmes
a)
1
Institute for Nano Quantum Information Electronics, The University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
3
Institute of Industrial Science, The University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Appl. Phys. Lett. 114, 112109 (2019)
Article history
Received:
January 09 2019
Accepted:
March 05 2019
Citation
Kang Gao, Helen Springbett, Tongtong Zhu, Rachel A. Oliver, Yasuhiko Arakawa, Mark J. Holmes; Spectral diffusion time scales in InGaN/GaN quantum dots. Appl. Phys. Lett. 18 March 2019; 114 (11): 112109. https://doi.org/10.1063/1.5088205
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