Abstract
The magneto-photoluminescence experiments have been performed on a coupled quantum dots (QDs) system composed of CdSe and CdMnSe QD double layers. The photoluminescence peaks from two QD layers forms a wide PL band due to the inhomogeneous broadening of QD ensemble in the coupled QD system. The intensity of the PL band undergoes significant change when a magnetic field is applied. Specifically, the QD system shows large difference in intensity between σ- and σ+ circular polarizations, which results from the spin polarization of carriers in the presence of magnetic field. Interestingly, while the lower energy side of the PL band was dominated by the σ+ circular polarization, the higher energy side of the band was dominated by the σ- circular polarization. Furthermore, the relative PL intensity at the low energy side of the band remarkably increases with decrease in excitation power for the σ+ circular polarization, while it showed no significant change for σ- circular polarization. Such polarization and excitation power-dependent behaviors of PL intensity enable us to identify the relative potential profile of the magnetic/non-magnetic coupled QD systems.
Original language | English |
---|---|
Pages (from-to) | 851-854 |
Number of pages | 4 |
Journal | Journal of Crystal Growth |
Volume | 311 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2009 Jan 15 |
Keywords
- A. Magnetic semiconductor
- A. Quantum dot
- E. Polarization
ASJC Scopus subject areas
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry