Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 17: Spintronics: Excitons and local spins (HL with MA/TT)

MA 17.7: Talk

Tuesday, March 17, 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. Yakovlev^1,2, Irina A. Yugova^1,3, Vladimir L. Korenev², Alexander Pawlis⁴, and Manfred Bayer¹ — ¹Experimentelle 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.