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

Publisher: Edp Sciences

E-ISSN: 2100-014x|41|issue|03015-03015

ISSN: 2100-014x

Source: EPJ Web of Conference, Vol.41, Iss.issue, 2013-03, pp. : 03015-03015

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Abstract

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.

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