Nano Archive

Ultrafast spin dynamics in colloidal ZnO quantum dots

Janssen, Nils and Whitaker, Kelly M. and Gamelin, Daniel R. and Bratschitsch, Rudolf (2008) Ultrafast spin dynamics in colloidal ZnO quantum dots. NANO LETTERS, 8 (7). pp. 1991-1994.

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Time-resolved Faraday rotation measurements in the ultraviolet have been performed to reveal the ultrafast spin dynamics of electrons in colloidal ZnO quantum dots. Oscillating Faraday rotation signals are detected at frequencies corresponding to an effective g factor of g* = 1.96. Biexponential oscillation decay is observed that is due to (i) rapid depopulation of the fundamental exciton (τ = 250 ps) and (ii) slow electron spin dephasing (T2* = 1.2 ns) within a metastable state formed by hole-trapping at the quantum dot surface.

Item Type:Article
Subjects:Physical Science > Nano objects
Physical Science > Nanoelectronics
Physical Science > Quantum phenomena
ID Code:6395
Deposited By:IoN
Deposited On:06 Aug 2009 14:48
Last Modified:06 Aug 2009 14:48

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