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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Official URL: http://pubs.acs.org/doi/full/10.1021/nl801057q

Abstract

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.

Item Type:Article
Uncontrolled Keywords:SEMICONDUCTOR NANOCRYSTALS; PHOTOLUMINESCENCE; PHOTOCHEMISTRY; CONFINEMENT; PARTICLES; EMISSION
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nanophysics
ID Code:6039
Deposited By:IoN
Deposited On:15 Sep 2009 10:16
Last Modified:15 Sep 2009 10:16

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