Surface spin magnetism controls the polarized exciton emission from CdSe nanoplatelets

30 Sep 2019  ·  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 ·

The surface of nominally diamagnetic colloidal CdSe nanoplatelets can demonstrate paramagnetism owing to the uncompensated spins of dangling bonds (DBSs). We reveal that by optical spectroscopy in high magnetic fields up to 15 Tesla using the exciton spin as probe of the surface magnetism... The strongly nonlinear magnetic field dependence of the circular polarization of the exciton emission is determined by the DBS and exciton spin polarization as well as by the spin-dependent recombination of dark excitons. The sign of the exciton-DBS exchange interaction can be adjusted by the nanoplatelet growth conditions. read more

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Mesoscale and Nanoscale Physics