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arXiv:1506.09028 · Physica E Low-dimensional Systems and Nanostructures

Single-electron coherence: Finite temperature versus pure dephasing

Michael V. Moskalets, Géraldine Haack

Published Sep 5, 2015• 25 citations
arXivHTMLPDF
DOI
10.1016/j.physe.2015.09.002

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We report measurements of ultralong coherence in self-assembled quantum dots. Transient four-wave mixing experiments at 5 K show an average dephasing time of 372 ps, corresponding to a homogeneous linewidth of 3.5 microeV, which is significantly smaller than the linewidth observed in single-dot luminescence. Time-resolved luminescence measurements show a lifetime of the dot ground state of 800 ps, demonstrating the presence of pure dephasing at finite temperature. The homogeneous width is lifetime limited only at temperatures approaching 0 K.