Strain and Spin-Orbit Effects in Self-Assembled Quantum Dots

M. Zielińskia, W. Jaskólskia, J. Aizpuruab, G.W. Bryantc aInstytut Fizyki UMK, Grudziądzka 5, 87-100 Toruń, Poland bDonostia International Physics Center, 20018 San Sebastian, Spain cNational Institute of Standards and Technology, Gaithersburg, MD 20899-8423, USA

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Received: 4 06 2005;

The effects of strain and spin-orbit interaction in self-assembled lens-shaped InAs/GaAs quantum dots are investigated. Calculations are performed with empirical tight-binding theory supplemented by the valence force field method to account for effects of strain caused by lattice mismatch at the InAs-GaAs interface. It is shown that both effects influence strongly the electron and hole energy structure: splitting of the energy levels, the number of bound states, density distributions, and transition rates. We show that piezoelectric effects are almost negligible in quantum dots of the size investigated.

DOI: 10.12693/APhysPolA.108.929 Erratum DOI: 10.12693/APhysPolA.110.443 PACS numbers:71.35.Cc