Spin Polarizing Neutral Excitons In Quantum Dots
Abstract
A high degree of spin polarization for the neutral exciton in individual InAs quantum dots, without any external magnetic field applied, is demonstrated. The polarization mechanism is shown to be due to the difference in capture time into the QD for the electrons and holes after photo excitation in the wetting layer. This leads to optical pumping of the QD nuclei by spin polarized electrons and hence suppression of the anisotropic electron—hole exchange interaction.
- Publication:
-
Physics of Semiconductors: 30th International Conference on the Physics of Semiconductors
- Pub Date:
- December 2011
- DOI:
- 10.1063/1.3666440
- Bibcode:
- 2011AIPC.1399..435L
- Keywords:
-
- polarization;
- quantum dots;
- excitons;
- 76.70.Fz;
- 81.07.Ta;
- 71.35.Cc;
- Double nuclear magnetic resonance dynamical nuclear polarization;
- Quantum dots;
- Intrinsic properties of excitons;
- optical absorption spectra