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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Official URL: http://pubs.acs.org/doi/full/10.1021/nl801057q
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 (iota = 250 ps) and (ii) slow electron spin dephasing (T-2* = 1.2 ns) within a metastable state formed by hole-trapping at the quantum dot surface.
|Uncontrolled Keywords:||SEMICONDUCTOR NANOCRYSTALS; PHOTOLUMINESCENCE; PHOTOCHEMISTRY; CONFINEMENT; PARTICLES; EMISSION|
|Subjects:||Material Science > Functional and hybrid materials|
Physical Science > Nanophysics
|Deposited On:||15 Sep 2009 10:16|
|Last Modified:||15 Sep 2009 10:16|
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