Ultrafast electron spin dynamics in ZnO and Zn1-xCoxO sol-gel thin films
1 Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
2 Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA
3 Department of Physics and Center for Applied Photonics, D-78464 Konstanz, Germany
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.
© Owned by the authors, published by EDP Sciences, 2013
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