Long lived coherence in self-assembled quantum dots - art. no. 227401

Citation
D. Birkedal et al., Long lived coherence in self-assembled quantum dots - art. no. 227401, PHYS REV L, 8722(22), 2001, pp. 7401
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
8722
Issue
22
Year of publication
2001
Database
ISI
SICI code
0031-9007(20011126)8722:22<7401:LLCISQ>2.0.ZU;2-Z
Abstract
We report measurements of ultralong coherence in self-assembled quantum dot s. Transient four-wave mixing experiments at 5 K show an average dephasing time of 372 ps, corresponding to a homogeneous linewidth of 3.5 mu eV, whic h is significantly smaller than the linewidth observed in single-dot lumine scence. Time-resolved luminescence measurements show a lifetime of the dot ground state of 800 ps, demonstrating the presence of pure dephasing at fin ite temperature. The homogeneous width is lifetime limited only at temperat ures approaching 0 K.