Size, shape, and strain dependence of the g factor in self-assembled In(Ga)As quantum dots
Abstract
We have investigated Zeeman splitting in single self-assembled InAs and InGaAs quantum dots experimentally and theoretically. By measuring photoluminescence from single dots, in a wide spectral region, we have obtained the exciton g factors of quantum dots with various photoluminescence energies. We find that the absolute value of the exciton g factors of InAs dots are smaller than those of the InGaAs dots, which differs from the composition dependence expected from that of the bulk ones. The experimentally obtained g factors are compared with calculated ones based on the eight-band k•p model where the influence of strain and the Zeeman effect are included. We find a good agreement between the calculation and the experiment qualitatively and quantitatively. The calculation reproduces the nontrivial composition dependence of the g factor of the quantum dots. In addition, the eight-band model predicts a size and shape dependence of the electron and hole g factors of the pyramidal quantum dots.
- Publication:
-
Physical Review B
- Pub Date:
- December 2004
- DOI:
- 10.1103/PhysRevB.70.235337
- Bibcode:
- 2004PhRvB..70w5337N
- Keywords:
-
- 73.21.-b;
- 71.35.-y;
- 71.18.+y;
- 71.70.Ej;
- Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems;
- Excitons and related phenomena;
- Fermi surface: calculations and measurements;
- effective mass g factor;
- Spin-orbit coupling Zeeman and Stark splitting Jahn-Teller effect