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Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Poster I

HL 35.3: Poster

Dienstag, 8. März 2016, 15:00–19:00, Poster A

Spin dynamics of Ce3+ ions in YAG crystals — •Felix Fobbe1, Vasilii Belykh1, Donghai Feng1, Eiko Evers1, Dmitry Yakovlev1,2, and Manfred Bayer1,21Experimentelle Physik 2, Technische Universitat Dortmund, D-44221 Dortmund, Germany — 2Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia

Spin dynamics of YAG crystals doped with Ce3+ ions were investigated by optical pump-probe Faraday rotation technique in a magnetic field. Resonant spin amplification (RSA) was measured by registering the amplitude of the Faraday rotation as a function of a magnetic field applied either in Voigt or Faraday geometry. Measurements were made at different temperatures and powers of the pump beam.

From the time resolved Faraday rotation it was shown that there are up to five electron spin precession frequencies that correspond to five g-factors ranging from 0.9 to 2.5 which show strong anisotropy. The spin ensemble dephasing time T2* is found to be in the range of 10 ns to 50 ns for the different frequencies. The RSA curve shows a strong peak around zero magnetic field in Voigt geometry and a strong dropdown in Faraday geometry. The amplitude of the peak and the dropdown decreases dramatically with increasing temperature. Their origin is presumably related to spin interaction.

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