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Proceedings Paper

Spin dynamics of InAs quantum dots with uniform height
Author(s): T. A. Kennedy; A. S. Bracker; S. G. Carter; S. E. Economou; D. Gammon; J. Whitaker
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Paper Abstract

Spin g-factors and lifetimes were studied with picosecond pump-probe techniques for a set of samples of InAs quantum dots of uniform height. The samples were grown by MBE with a cap and flush sequence to produce a height of 2.5 nm. Remote doping provided electrons in the dots. Electron coherence was excited by a fast pump pulse and detected through the Faraday rotation of a probe pulse. The results show an in plane g-factor of 0.427 and lifetimes around 1 ns that shorten for increasing magnetic fields. For an undoped sample, signals from singly charged and neutral dots are observed and simulated to provide the hole g-factor and parameters for the neutral exciton. The undoped sample also exhibits signals for negative delays attributed to mode-locking of the spin coherence to the optical pulse train. This observation indicates that the true spin coherence lasts at least 12 ns.

Paper Details

Date Published: 29 January 2008
PDF: 8 pages
Proc. SPIE 6903, Advanced Optical Concepts in Quantum Computing, Memory, and Communication, 69030Q (29 January 2008); doi: 10.1117/12.772325
Show Author Affiliations
T. A. Kennedy, Naval Research Lab. (United States)
A. S. Bracker, Naval Research Lab. (United States)
S. G. Carter, Naval Research Lab. (United States)
S. E. Economou, Naval Research Lab. (United States)
D. Gammon, Naval Research Lab. (United States)
J. Whitaker, A.T.K. Thiokol (United States)

Published in SPIE Proceedings Vol. 6903:
Advanced Optical Concepts in Quantum Computing, Memory, and Communication
Zameer U. Hasan; Alan E. Craig; Philip R. Hemmer, Editor(s)

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