期刊
NANO LETTERS
卷 15, 期 6, 页码 4214-4222出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01566
关键词
Dark exciton; CdSe; nanocrystal; spin flip; dynamic polarization; magnetic polaron
类别
资金
- RFBR [13-02-00888]
- Government of Russia [14.Z50.31.0021]
- Office of Naval Research (ONR) through the Naval Research Laboratory
We predict theoretically that nonmagnetic CdSe nanocrystals May possess macroscopic magnetic moments due to the formation of dangling-bond magnetic polarons (DBMPs). A DBMP is created in optically pumped nanocrystals by dynamic polarization of dangling bond spins, (DBSs) at the nanocrystal surface during radiative recombination of the ground state dark exciton assisted by a spin-flip of the DBS. The formation of DBMPs suppresses the radiative recombination of the dark exciton and leads to a temperature-dependent Contribution to the Stokes shift of the photoluminescence. This model consistently explains the experimentally observed low-temperature photoluminescence features of nonmagnetic cdSe nano crystals as manifestation's of their spin-related magnetic properties.
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