Femtosecond coherent control of spins in (Ga,Mn)as ferromagnetic semiconductors using light

Academic Article

Abstract

  • Using density matrix equations of motion, we predict a femtosecond collective spin tilt triggered by nonlinear, near-ultraviolet (∼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. © 2009 The American Physical Society.
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    Author List

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

  • 103
  • Issue

  • 4