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

doi:10.1103/PhysRevB.74.073407

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

Materials Science 2009-11-11 v1

Authors: H. Hoffmann , G. V. Astakhov , T. Kiessling , W. Ossau , G. Karczewski , T. Wojtowicz , J. Kossut , L. W. Molenkamp

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

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.

Keywords

optical spin pumping modulation doped electrons CdTe quantum wells two-color Kerr rotation spin relaxation time Hanle-MOKE

Cite

@article{arxiv.cond-mat/0606419,
  title  = {Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique},
  author = {H. Hoffmann and G. V. Astakhov and T. Kiessling and W. Ossau and G. Karczewski and T. Wojtowicz and J. Kossut and L. W. Molenkamp},
  journal= {arXiv preprint arXiv:cond-mat/0606419},
  year   = {2009}
}

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

Abstract

Keywords

Cite

Related papers