Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 63: Poster: Enabling Technologies: Quantum Materials, Quantum Dots, Quantum Wires, Point Contacts and Superconducting Systems
FM 63.6: Poster
Mittwoch, 25. September 2019, 16:30–18:30, Tents
Exciton spin and recombination dynamics in CdSe nanocrystals in glass matrix — •Gang Qiang1, Elena V. Shornikova1,2, Dmitri R. Yakovlev1,3, Aleksandr A. Golovatenko3, Anna V. Rodina3, Evgeniy A. Zhukov1, Alexey A. Onushchenko4, and Manfred Bayer1,3 — 1Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany. — 2Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia. — 3Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia. — 4ITMO University, 199053, St.-Petersburg, Russia
Semiconductor quantum dot spin as one of the carrier candidates for quantum bit or Qubit has attracted much attention during the last few decades. With time going by, the technics to prepare samples also become more and more powerful, such as molecular beam epitaxy, wet-chemical method, solid state reaction and so on. Former experiments have suggested that surface states of nanocrystals (NCs) play an important role in determining their thermodynamic, transport and optical properties. Comparing with colloidal NCs synthesized using wet chemical method, those grown in glass matrix are quite different, especially their surface state. NCs in glass matrix are completely free from passivation and the surface is dominated by dangling bond orbitals which sharply modify their magneto-optical properties. In this work, we studied the spin and recombination dynamics of exciton confined in CdSe nanocrystals grown in glass matrix with diameter range from 2.8 to 6.2 nm.