Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 35: HL Poster II
HL 35.30: Poster
Wednesday, April 3, 2019, 17:30–20:00, Poster E
Exciton spin relaxation and recombination dynamics in CdSe nanocrystals in glass matrix — •Gang Qiang1, Elena V. Shornikova1, Dmitri R. Yakovle1,2, Aleksandr A. Golovatenko2, Anna V. Rodina2, Evgeniy A. Zhukov1, Aleksei A. Onushchenko3, and Manfred Bayer1,2 — 1Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany. — 2Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia. — 3ITMO University, 199053, St.-Petersburg, Russia.
We studied CdSe nanocrystal (NC) samples with diameter from 2.8 to 6.2 nm grown in glass matrix in this work. Temperature and magnetic field dependence of photoluminescence (PL) decay demonstrates the exciton nature of emission states. The longest component of the PL decay is ascribed to the dark exciton with a time constant 212 ns at 0 T, 2.2 K, which decreases to 118 ns at 17 T because of the magnetic field induced mixing between bright and dark states. The time and polarization resolved PL intensity reveals very fast spin relaxation dynamics which is beyond our time-resolution. And the acoustic phonons are expected to be involved in the coupling between upper 0 and 2 levels and give rise to the emission of linearly polarized light.