Temperature-induced spin-coherence dissipation in quantum dots

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Temperature-induced spin-coherence dissipation in quantum dots

F. G. G. Hernandez, A. Greilich, F. Brito, M. Wiemann, D. R. Yakovlev, D. Reuter, A. D. Wieck, and M. Bayer

Phys. Rev. B 78, 041303(R) – Published 11 July 2008

Abstract

The temperature dependence of electron-spin coherence in singly negatively charged (In,Ga)As/GaAs quantum dots is studied by time-resolved Faraday rotation. The decoherence time $T_{2}$ is constant on the microsecond scale for temperatures below 15 K; for higher temperatures it shows a surprisingly sharp drop into the nanosecond range. The decrease cannot be explained through inelastic scattering with phonons, and it may be related to elastic scattering due to phonon-mediated fluctuations of the hyperfine interaction.

Received 11 March 2008

DOI:https://doi.org/10.1103/PhysRevB.78.041303

Authors & Affiliations

F. G. G. Hernandez^1,*, A. Greilich¹, F. Brito², M. Wiemann¹, D. R. Yakovlev¹, D. Reuter³, A. D. Wieck³, and M. Bayer¹

¹Experimentelle Physik II, Technische Universität Dortmund, D-44221 Dortmund, Germany
²IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA
³Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

^*On leave from Instituto de Física Gleb Wataghin, UNICAMP, SP, Brazil; felix@ifi.unicamp.br

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Issue

Vol. 78, Iss. 4 — 15 July 2008

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