Atomic ordering and bond relaxation in optical spectra of self-organized InP/GaInP2 Wigner molecule structures
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We used transmission electron microscopy, Raman, and photoluminescence spectroscopy to identify the effect of CuPt-type GaP-InP atomic ordering (AO) on the structural and emission properties of self-organized (SO) InP/GaInP2 Wigner molecule (WM) quantum dot (QD) structures. We found that the correlation of AO and SO growth results in the formation of InP/GaInP2 QD/AO-domain (QD/AOD) core-shell composites. This observation shows that intrinsic WMs in this system emerge due to a strong piezoelectric field generated by AODs, which induces QD doping and a built-in magnetic field. We found that the bond relaxation of AODs leads to a decrease in the emission energy of WMs of 80 meV. The photoluminescence spectra of single WMs having an emission energy ∼1.53 eV are presented here, the lowest one reported for this system.
Mintairov , A M , Lebedev , D V , Bert , N , Belyaev , K G , Nevedomskiy , V N , Rakhlin , M V , Toropov , A A , Vlasov , A S , Gocalinska , A , Juska , G , Pelucchi , E , Arredondo , M A , Naden , A B , Shelaev , A V & Bykov , V A 2019 , ' Atomic ordering and bond relaxation in optical spectra of self-organized InP/GaInP 2 Wigner molecule structures ' , Applied Physics Letters , vol. 115 , no. 20 , 202104 . https://doi.org/10.1063/1.5126527
Applied Physics Letters
Copyright © 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
DescriptionA.M.M., D.V.L., and A.S.V. acknowledge the support of the Russian Science Foundation Grant No. 19-19-00246. K.G.B., M.V.R., and A.A.T. acknowledge the financial support of the Russian Foundation for Basic Research (Project No. 18-02-01212). This research was also enabled by the Science Foundation Ireland under Grant Nos. 15/IA/2864, 12/RC/2276, 12/RC/2276-P2, and 18/US/3512, and the Northern Ireland Department for the Economy (Grant No. USI-140). A.B.N. acknowledges support from EPSRC grant no. EP/R023751/1.
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