Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.80: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Spin-flip Raman scattering in colloidal CdSe nanoplatelets — •Dennis Kudlacik1, Victor Sapega2, Jörg Debus1, Benoit Dubertret3, Dmitri Yakovlev1, and Manfred Bayer1,2 — 1Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany — 2Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — 3Laboratoire de Physique et d’Etude des Matériaux, UMR8213 du CNRS, ESPCI, 75231 Paris, France
Colloidal CdSe nanoplatelets (NPLs) are highly efficient light emitting materials exhibiting unique optical properties that are very promising for many applications in nanotechnology. Even though there has been a continuous study on these colloidal nanostructures investigating their optical properties, a comprehensive and unified picture of electronic spin-based interactions is still missing up to now. Therefore, we have studied the resonant spin-flip Raman scattering (SFRS) in self-assembled colloidal CdSe nanoplatelets in Faraday and tilted geometries at external magnetic fields of up to 10 T. We have observed an intense first and second order Raman signal, which can be attributed to a spin-flip of a resident electron induced by a photocreated exciton inside of this colloidal quantum well. From a magnetic field dependence of the electron spin-flip energy, measured in Faraday and Voigt geometry, isotropic g-factors of ge = 1.623 and 3.242 have been determined. Furthermore, we have observed that the SFRS exhibits a strong dependence on temperature. With increasing temperature, the electron spin dephasing time is considerably reduced.