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28 March 2024
 
  » arxiv » cond-mat/0606419

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Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique
H. Hoffmann ; G. V. Astakhov ; T. Kiessling ; W. Ossau ; G. Karczewski ; T. Wojtowicz ; J. Kossut ; L. W. Molenkamp ;
Date 15 Jun 2006
Subject Materials Science
AbstractWe report on optical spin pumping of modulation electrons in CdTe-based quantum wells with low intrinsic electron density (by 10^10 cm^{-2}). Under continuous wave excitation, we reach a steady state accumulated spin density of about 10^8 cm^{-2}. Using a two-color Hanle-MOKE technique, we find a spin relaxation time of 34 ns for the localized electrons in the nearly unperturbed electron gas. Independent variation of the pump and probe energies demonstrates the presence of additional non-localized electrons in the quantum well, whose spin relaxation time is substantially shorter.
Source arXiv, cond-mat/0606419
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