29 January 2008 Spin dynamics of InAs quantum dots with uniform height
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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.
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T. A. Kennedy, A. S. Bracker, S. G. Carter, S. E. Economou, D. Gammon, J. Whitaker, "Spin dynamics of InAs quantum dots with uniform height", Proc. SPIE 6903, Advanced Optical Concepts in Quantum Computing, Memory, and Communication, 69030Q (29 January 2008); doi: 10.1117/12.772325; https://doi.org/10.1117/12.772325
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