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Piezoelectric Effects on the Electron–Hole Dipole in In0.5Ga0.5As/GaAs Self-Assembled Quantum Dots

✍ Scribed by A. Levin; A. Patanè; F. Schindler; A. Polimeni; L. Eaves; P.C. Main; M. Henini

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
81 KB
Volume
224
Category
Article
ISSN
0370-1972

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✦ Synopsis

Photocurrent spectroscopy is used to investigate the quantum-confined Stark shift, QCSS, of In 0.5 Ga 0.5 As/GaAs self-assembled quantum dots (QDs) grown on (100) and (311)B planes. An asymmetric dependence of the QCSS with respect to the direction of the electric field is observed in both cases. We show that the (100) dots have an almost zero permanent electron-hole dipole moment. This result indicates that the recently reported "inverted electron-hole alignment" [Phys. Rev. Lett. 84, 733 (2000)] is not a general property of QDs. By comparing the QCSS for the (100) and (311)B dots, we propose that in the dots grown on the high index plane, the electron and hole wavefunctions are displaced by a strain-induced piezoelectric field.

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