Effect of second-order piezoelectricity on the excitonic structure of stress-tuned In(Ga)As/GaAs quantum dots

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Authors	KLENOVSKÝ Petr STEINDL Petr ABERL Johannes ZALLO Eugenio TROTTA Rinaldo RASTELLI Armando FROMHERZ Thomas
Year of publication	2018
Type	Article in Periodical
Magazine / Source	Physical Review B
MU Faculty or unit	Faculty of Science
Citation
Web	https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.245314
Doi	http://dx.doi.org/10.1103/PhysRevB.97.245314
Keywords	piezoelectricity; quantum dot; excitonic fine-structure; dipole
Description	We study the effects of the nonlinear piezoelectricity and the In distribution on the exciton energy, the electronhole electric dipole moment, and the fine-structure splitting in stress-tunable In(Ga)As/GaAs quantum dots integrated onto a piezoelectric actuator. In particular, we investigate in detail the contributions of various elements of the expansion of the electrical polarization in terms of externally induced elastic strain on the latter two important quantum dot properties. Based on the comparison of the effects of first- and second-order piezoelectricity we provide a simple relation to estimate the influence of applied anisotropic stress on the quantum dot dipole moment for quantum dots significantly lattice mismatched to the host crystal.
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