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Room-Temperature Electron Spin Dynamics in Free-Standing ZnO Quantum Dots
Physical Review Letters (2007)
  • W. K. Liu
  • K. M. Whitaker
  • A. L Smith
  • Kevin R. Kittilstved, University of Massachusetts - Amherst
  • B. H. Robinson
  • D. R. Gamelin

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 T2*=25  ns, as determined from linewidth analysis. Increasing the electron population leads to increased g* and decreased T2*, both associated with formation of P-shell configurations. A clear relationship between T2* and hyperfine coupling with 67Zn(I=5/2) is observed.

Publication Date
Publisher Statement
Doi:10.1103/PhysRevLett.98.186804 Copyright 2007 by The American Physical Society.
Citation Information
W. K. Liu, K. M. Whitaker, A. L Smith, Kevin R. Kittilstved, et al.. "Room-Temperature Electron Spin Dynamics in Free-Standing ZnO Quantum Dots" Physical Review Letters Vol. 98 Iss. 18 (2007)
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