Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique

Details Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique

2006-06-15

arxiv.org/abs/cond-mat/0606419v1

Phys. Rev. B 74, 073407 (2006)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.74.073407

We 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.

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