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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.29: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Spin dynamics and magneto-optical effects in YAG:Ce — •Kai Hühn, Jan Gerrit Lonnemann, Jens Hübner, and Michael Oestreich — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover

The peculiar spin dynamics of carriers localized at Ce sites in YAG has recently drawn considerable attention [1]. Here we present the magneto-optical investigation on the ²F_5/2→ ²D_3/2 transition in a highly doped YAG:Ce³⁺ crystal at low temperatures. The photoluminescence spectrum reveals the zero-phonon-line position at 2.53346(16) eV. We resolve the complex system of phonon replicas which are explained with an idealized theoretical model. Furthermore, we measure the magneto-optical Voigt-Effect on a linear polarized probe laser beam for transversal magnetic fields showing a strong temperature and strain dependence.
The information of spin dynamics is generally contained within its equilibrium noise spectrum. A spin noise spectrum is obtained by mapping the spin fluctuations onto the linear polarization of a transmitted probe laser beam [2]. By using this technique we determine a spin decoherence time T₂ of 10.6(13) ns which coincide well with previously reported values [3].

[1] P. Siyushev et al., Nature Com. 5, 3895 (2014)
J. Hübner et al., phys. stat. sol. b 251, 1521-3951 (2014)
R. Kolesov et al., Phys. Rev. Lett. 111, 120502 (2013)