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- Title
SPIN-RESOLVED MAGNETO-OPTICAL STUDY OF CdSe SINGLE QUANTUM DOT.
- Authors
Chen, Zhanghai; Bai, L. H.; Huang, S. H.; Xiong, H.; Shen, S. C.; Souma, I.; Hyomi, K.; Murayama, A.; Oka, Y.
- Abstract
We report on the magneto-optical study of spin polarized energetic fine structures for exciton complex in single CdSe quantum dot (QD) by using micro- photoluminescence (micro-PL) spectroscopy. The zero-field splitting of exciton luminescence peak arisen from the anisotropic exchange interaction of carriers in the QDs was observed. The g-factors for exciton and negatively-charged exciton, i.e. trion in a single QD were determined by fitting the magnetic field dependence of the corresponding PL peaks. By exciting the single QD with circularly polarized light of σ- and σ+ polarization, the spin-up and spin-down trions were selectively generated. The ratio, τ/τsf, of the exciton lifetime and the time constants for the spin-flipping process of trion in a single QD was estimated to be 0.13, which implies a long spin-lifetime in single CdSe QD.
- Subjects
QUANTUM dots; PHOTOLUMINESCENCE; MAGNETOOPTICS; EXCITON theory; OPTICAL polarization; QUANTUM electronics
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2007, Vol 21, Issue 8/9, p1549
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979207043178