Effect of second-order piezoelectricity on the excitonic structure of stress-tuned InGaAs/GaAs quantum dots
Sprache des Titels:
Englisch
Original Kurzfassung:
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.
Sprache der Kurzfassung:
Englisch
Journal:
Physical Review B: Condensed Matter and Materials Physics
Forschungs-