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Atomistic Simulation of Non-Degeneracy and Optical Polarization Anisotropy in Pyramidal Quantum Dots

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5 Author(s)
Ahmed, S. ; Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN ; Usman, Muhammad ; Kharche, N. ; Schliwa, A.
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Self-assembled quantum dots (QDs) realized by Stranski-Krastanov growth mode often demonstrate polarized transitions in quantized electron (hole) states and non-degeneracy in the first excited state in various spectroscopic analyses. These observations confirm the presence of certain symmetry breaking/lowering mechanisms in these low dimensional QDs which cannot be represented accurately with continuum material representations. Atomistic calculations indeed reveal optical polarization anisotropy and non-degeneracy in the excited states due to underlying crystalline symmetry, atomistic long-range strain and piezoelectric fields. This work presents the use of the comprehensive atomistic simulation package NEMO 3D in the study of competing effects in realistically-sized pyramidal InAs/GaAs quantum dots.

Published in:

Nano/Micro Engineered and Molecular Systems, 2007. NEMS '07. 2nd IEEE International Conference on

Date of Conference:

16-19 Jan. 2007