Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets

Academic Article

Abstract

  • Using density matrix equations of motion, we predict a femtosecond collective spin tilt triggered by nonlinear, near--ultraviolet ($\sim$3eV), coherent photoexcitation of (Ga,Mn)As ferromagnetic semiconductors with linearly polarized light. This dynamics results from carrier coherences and nonthermal populations excited in the \{111\} equivalent directions of the Brillouin zone and triggers a subsequent uniform precession. We predict nonthermal magnetization control by tuning the laser frequency and polarization direction. Our mechanism explains recent ultrafast pump--probe experiments.
  • Authors

    Published In

    Keywords

  • cond-mat.str-el, cond-mat.str-el
  • Digital Object Identifier (doi)

    Author List

  • Kapetanakis MD; Perakis IE; Wickey KJ; Piermarocchi C; Wang J
  • Start Page

  • 047404
  • Volume

  • 103