EPJ Web of Conferences (Mar 2013)

Ultrafast electron spin dynamics in ZnO and Zn1-xCoxO sol-gel thin films

  • Leitenstorfer A.,
  • Rüdiger U.,
  • Fonin M.,
  • Stiehm T.,
  • Janßen N.,
  • Ochsenbein S. T.,
  • Beha K.,
  • Whitaker K.,
  • Kiliani G.,
  • Raskin M.,
  • Gamelin D. R.,
  • Bratschitsch R.

DOI
https://doi.org/10.1051/epjconf/20134103015
Journal volume & issue
Vol. 41
p. 03015

Abstract

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We probe the electron spin dynamics in ZnO and Zn1-xCoxO sol-gel films with time-resolved Faraday rotation spectroscopy. Dephasing times T2* on the order of nanoseconds are observed at room temperature due to charge-separated states. In ZnCoO the effective electron Landé g factor rises with increasing Co2+ concentration, providing the mean-field electron-Co2+ exchange energy N0α = +0.25 ± 0.02 eV.