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Mintairov A.;Lebedev D.;Bert N.;Belyaev K.;Nevedomskiy V.;Rakhlin M.;Toropov A.;Vlasov A.;Gocalinska A.;Juska G.;Pelucchi E.;Arredondo M.;Naden A.;Shelaev A.;Bykov V.
Applied Physics Letters
Atomic ordering and bond relaxation in optical spectra of self-organized InP/GaInP2 Wigner molecule structures
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2019 Author(s). 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.
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