Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
We study magnetooptical properties of a new class of diluted magnetic semiconductor (DMS) nanocrystals: colloidal nanoplatelets (NPLs) with Mn2+-doped layers [1]. The
studied NPLs have two monolayer-thick CdSe cores surrounded by 4 monolayer CdS or CdMnS shells. We probe exciton interaction with Mn2+ ions by three experimental
techniques:
1. Circularly polarized photoluminescence in applied magnetic fi eld. The degree of polarization is positive in DMS NPLs and negative in the non-magnetic ones.
2. Spin-flip Raman scattering of exciton interacting with Mn2+ spins. Several clear resonances are observed. They are shifted from the laser line by energy ngMnµBB, where n is an integer number, gMn is the Mn2+ g-factor, µB is the Bohr magneton, B is the magnetic eld strength.
3. Optically detected magnetic resonance (ODMR). The resonance fi eld corresponds to the condition gMnµBB = hvmw, where vmw = 59.6 GHz is the microwave frequency, h is the Planck constant. The Mn2+ spin-lattice relaxation time varies from 405 to 20 µs in our samples. This corresponds to Mn2+ content in the shells from 0.9% to 2.9%.
This work was supported by the Deutsche Forschungsgemeinschaft through the International Collaborative Research Center TRR 160 (Projects B1, B2, and C7).
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