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Long coherence times in self-assembled semiconductor quantum dots

✍ Scribed by D. Birkedal; K. Leosson; J.M. Hvam

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
185 KB
Volume
31
Category
Article
ISSN
0749-6036

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✦ Synopsis

We report measurements of ultra-long 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 Β΅eV, 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.

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