Temperature induced spin coherence dissipation in quantum dots
  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 T2 is constant on a microsecond scale for temperatures below 20 K, for higher temperatures it shows a surprisingly sharp drop into the nanoseconds range. The decrease cannot be explained through inelastic scattering with phonons, and may be related with elastic scattering due to phonon-mediated fluctuations of the hyperfine interaction. 
F. G. G. Hernandez, A. Greilich, F. Brito, M. Wiemann, D. R. Yakovlev,   D. Reuter, A. D. Wieck, and M. Bayer