期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.046601
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资金
- Natural Sciences and Engineering Research Council of Canada
Hole spin relaxation dynamics in CdTe/CdSe core-shell nanocrystals are measured by an ultrafast polarization transient grating technique. Photoexcited charge separation in type II structures suppresses the electron-hole exchange interaction and the hole spin relaxation time constant is found to increase from similar to 0.3 ps to similar to 10 ps at 293 K as the CdSe shell thickness increases from similar to 0.2 nm to similar to 2.4 nm. Analysis of these data suggests that spin relaxation in semiconductor nanostructures is tunable between type I and type II localization according to an electron-hole overlap function.
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