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Fine-structure splitting of exciton states in quantum dot molecules: symmetry and tunnel-coupling effects
- Source :
- J. Phys.: Condens. Matter 20, 045204 (2008)
- Publication Year :
- 2007
-
Abstract
- Exciton levels and fine-structure splitting in laterally-coupled quantum dot molecules are studied. The electron and hole tunneling energies as well as the direct Coulomb interaction are essential for the exciton levels. It is found that fine-structure splitting of the two-lowest exciton levels is contributed from the intra- and inter-dot exchange interactions, both of which are largely influenced by the symmetry and tunnel-coupling between the two dots. As the inter-dot separation is reduced, fine-structure splitting of the exciton ground state is largely increased while those of the excited states are decreased. Moreover, the dependence of the fine-structure splitting in quantum dot molecules on the Coulomb correlation is clearly clarified.<br />Comment: 8 pages, 8 figures
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- J. Phys.: Condens. Matter 20, 045204 (2008)
- Publication Type :
- Report
- Accession number :
- edsarx.0705.3880
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/0953-8984/20/04/045204