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Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 23: Spintronics: Excitons and local spins (with MA/TT)

HL 23.7: Vortrag

Dienstag, 17. März 2015, 11:00–11:15, ER 270

Induced nuclear spin polarization in ZnSe:F epilayers — •Johan Erik Kirstein1, Fabian Heisterkamp1, Evgeny A. Zhukov1, Alex Greilich1, Dmitri R. Yakovlev1,2, Irina A. Yugova1,3, Vladimir L. Korenev2, Alexander Pawlis4, and Manfred Bayer11Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany — 2Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — 3Physical Faculty of St. Petersburg State University, 198504 St. Petersburg, Russia — 4Department Physik, Universität Paderborn, 33098 Paderborn, Germany

We study the interaction of electron and nuclear spins in fluorine-doped ZnSe epilayers. Using the time-resolved optical pump-probe spectroscopy in the regime of resonant spin amplification we are able to resolve nuclear magnetic resonances (NMR) of 77Se and 67Zn isotopes with non-zero spin. The effective nuclear fields show a dispersive form of its strength around NMR as a function of magnetic field. In the RSA signal this leads a shift of the resonances of the electron spins. Dependences are measured as a function of external parameters, like: pump power, polarization modulation frequency and temperature. In a further experiment an external radio frequency field is applied to investigate the strength of the resulting nuclear field. Theoretical considerations support our findings.

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