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HL: Fachverband Halbleiterphysik

HL 40: II-VI semiconductors

HL 40.5: Vortrag

Donnerstag, 15. März 2018, 12:00–12:15, EW 201

Full characterization of nuclear spin dynamics in CdTe quantum wells — •Eiko Evers¹, Tomasz Kazimierczuk^1,2, Alex Greilich¹, Dmitri Yakovlev^1,3, Grzegorz Karczewski⁴, Tomasz Wojtowicz⁴, Jacek Kossut⁴, and Manfred Bayer^1,3 — ¹Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany — ²Institute of Experimental Physics, Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland — ³Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — ⁴Institute of Physics, Polish Academy of Sciences, 02668 Warsaw, Poland

In an n-doped CdTe quantum well structure, we studied the nuclear spin coherent and relaxation dynamics in the presence of coherently spin-polarized electrons by optically detected nuclear magnetic resonance (NMR). The pulsed, optical excitation leads to a partial transfer of the electron polarization to the nuclear spin bath. Thus, a considerable Overhauser field is induced which changes the electron spin precession frequency, detected by time-resolved Faraday rotation. We employed pulsed NMR techniques to selectively study the dynamics of all constituent nuclei separately, both the longitudinal and the transverse dynamics in an external magnetic field.