Long-lived electron spin coherence in CdSe/ZnSSe self-assembled quantum dots

Details Long-lived electron spin coherence in CdSe/ZnSSe self-assembled quantum dots Long-lived electron spin coherence in CdSe/ZnSSe self-assembled quantum dots

2011-09-29

arxiv.org/abs/1109.6425v1

Physical Review B 84, 085304 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 7 figures, 1 table

Scientific paper

10.1103/PhysRevB.84.085304

The electron spin coherence in n-doped and undoped, self-assembled CdSe/Zn(S,Se) quantum dots has been studied by time-resolved pump-probe Kerr rotation. Long-lived spin coherence persisting up to 13 ns after spin orientation has been found in the n-doped quantum dots, outlasting significantly the lifetimes of charge neutral and negatively charged excitons of 350 - 530 ps. The electron spin dephasing time as long as 5.6 ns has been measured in a magnetic field of 0.25 T. Hyperfine interaction of resident electrons with a nuclear spin fluctuations is suggested as the main limiting factor for the dephasing time. The efficiency of this mechanism in II-VI and III-V quantum dots is analyzed.

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