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Shornikova, Elena V; Golovatenko, Aleksandr A; Yakovlev, Dmitri R; Rodina, Anna V; Biadala, Louis; Qiang, Gang; Kuntzmann, Alexis; Nasilowski, Michel; Dubertret, Benoit; Polovitsyn, Anatolii; Moreels, Iwan; Bayer, Manfred
Nature nanotechnology, 04/2020, Volume: 15, Issue: 4Journal Article
The surface of nominally diamagnetic colloidal CdSe nanoplatelets can demonstrate paramagnetic behaviour owing to the uncompensated spins of dangling bonds, as we reveal here by optical spectroscopy in high magnetic fields up to 15 T using the exciton spin as a probe of the surface magnetism. The strongly nonlinear magnetic field dependence of the circular polarization of the exciton emission is determined by the magnetization of the dangling-bond spins (DBSs), the exciton spin polarization as well as the spin-dependent recombination of dark excitons. The sign of the exciton-DBS exchange interaction depends on the nanoplatelet growth conditions.
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