Ultrafast spin dynamics in colloidal ZnO quantum dots

被引：37
|
作者：
Janssen, Nils [1 ,2 ]
Whitaker, Kelly M. [3 ,4 ]
Gamelin, Daniel R. [3 ,4 ]
Bratschitsch, Rudolf [1 ,2 ]
机构：
[1] Univ Konstanz, Dept Phys, D-78464 Constance, Germany
[2] Univ Konstanz, Ctr Appl Photon, D-78464 Constance, Germany
[3] Univ Washington, Dept Chem, Seattle, WA 98195 USA
[4] Univ Washington, Ctr Nanotechnol, Seattle, WA 98195 USA
来源：
NANO LETTERS | 2008年 / 8卷 / 07期
关键词：
D O I：
10.1021/nl801057q
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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.
引用
收藏
页码：1991 / 1994
页数：4
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