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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 Yakovlev^1,2, and Manfred Bayer^1,2 — ¹Experimentelle 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.