Temperature induced spin coherence dissipation in quantum dots

Details Temperature induced spin coherence dissipation in quantum dots Temperature induced spin coherence dissipation in quantum dots

2008-03-11

arxiv.org/abs/0803.1579v2

Phys. Rev. B 78, 041303(R) (2008)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.78.041303

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.

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