Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.085
Publication date: 6th July 2018
We present our recent results on the optical and magneto-optical studies of charged and neutral excitons in ensemble of CdSe-based colloidal nanoplatets (NPLs). The influence of the temperature and external magnetic field on the time-resolved dynamics of photoluminescence (PL) allows us to distinguish between the recombination originating from neutral and changed excitons. We compare the dependence of the fine structure energy splitting of the neutral exciton on the NPLs thickness determined by different experimental methods with the theoretical calculations. We show that at low temperatures the PL in CdSe bare NPLs is determined by the radiative recombination of the lowest dark (spin-forbidden) exciton. We propose an effective mechanism of the dark exciton activation via the exchange interaction with surface dangling bonds. We discuss the mechanisms of the dangling bond spins alignment in external magnetic field and its effect on the exciton spin polarization [3].
The sign of the circular polarization of the PL induced in magnetic field allows us to distinguish between the recombination originating from negative or positive trions. The theoretical analysis of the magnetic field dependences of the degree of circular polarization (DCP) and of the Spin Flip Raman Scattering (SFRS) energy shift allows us to determine the effective g-factor controlling the Zeeman splitting of the spin sublevels of resident electrons, excitons and holes in the negative trion in external magnetic field. The maximum value of the DCP and the SFRS intensity allow us to extract an information about the preferable orientation of the NPLs in the ensemble.
This work was supported in part by the Russian Foundation for Basic Research (Grant No. 17-02-01063 and Grant No. 15-52-12015).
[1] E. V. Shornikova, L. Biadala, D. R. Yakovlev, V. F. Sapega, Y. G. Kusrayev, A. A. Mitioglu, M. V. Ballottin, P. C. M. Christianen, V. V. Belykh, M. V. Kochiev, N. N. Sibeldin, A. A. Golovatenko, A. V. Rodina, N. A. Gippius, A. Kuntzmann, Ye Jiang, M. Nasilowski, B. Dubertret, M.Bayer, Nanoscale 10, 646 (2018).
[2] E. V. Shornikova, L. Biadala, D. R. Yakovlev, D. H. Feng, V. F. Sapega, N. Flipo, A. A. Golovatenko, M. A. Semina, A. V. Rodina, A. A. Mitioglu, M. V. Ballottin, P. C. M. Christianen, Y. G. Kusrayev, M. Nasilowski, B. Dubertret, M. Bayer, Nano Letters 18, 373 (2018).
[3] A.V Rodina, A.A. Golovatenko, E.V. Shornikova, D.R. Yakovlev, Al.L. Efros, Journal of Electronic Materials 4, 2018
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