Spin dynamics of InAs quantum dots with uniform height

T. A. Kennedy; A. S. Bracker; S. G. Carter; S. E. Economou; D. Gammon; J. Whitaker

doi:10.1117/12.772325

29 January 2008 Spin dynamics of InAs quantum dots with uniform height

T. A. Kennedy, A. S. Bracker, S. G. Carter, S. E. Economou, D. Gammon, J. Whitaker

Proceedings Volume 6903, Advanced Optical Concepts in Quantum Computing, Memory, and Communication; 69030Q (2008) https://doi.org/10.1117/12.772325
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

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.

Citation Download Citation

T. A. Kennedy, A. S. Bracker, S. G. Carter, S. E. Economou, D. Gammon, and 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); https://doi.org/10.1117/12.772325

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