Room-temperature electron spin dynamics in free-standing ZnO quantum dots

被引：117

作者：

Liu, William K. ^{[1
]}

Whitaker, Kelly M.

Smith, Alyssa L.

Kittilstved, Kevin R.

Robinson, Bruce H.

Gamelin, Daniel R.

机构：

[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA

[2] Univ Washington, Ctr Nanotechnol, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.98.186804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Conduction band electrons in colloidal ZnO quantum dots have been prepared photochemically and examined by electron paramagnetic resonance spectroscopy. Nanocrystals of 4.6 nm diameter containing single S-shell conduction band electrons have g(*)=1.962 and a room-temperature ensemble spin-dephasing time of T-2*=25 ns, as determined from linewidth analysis. Increasing the electron population leads to increased g(*) and decreased T-2*, both associated with formation of P-shell configurations. A clear relationship between T-2* and hyperfine coupling with Zn-67(I=5/2) is observed.

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页数：4

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