We show that anisotropic biaxial stress can be used to tune the built-in dipole moment of excitons confined in In(Ga)As quantum dots up to complete erasure of its magnitude and inversion of its sign. We demonstrate that this phenomenon is due to piezoelectricity. We present a model to calculate the applied stress, taking advantage of the so-called piezotronic effect, which produces significant changes in the current-voltage characteristics of the strained diode-membranes containing the quantum dots. Finally, self-consistent k·p calculations reveal that the experimental findings can be only accounted for by the nonlinear piezoelectric effect, whose importance in quantum dot physics has been theoretically recognized although it has proven difficult to single out experimentally.

Inversion of the exciton built-in dipole moment in In(Ga)As quantum dots via nonlinear piezoelectric effect / Aberl, J.; Klenovsky, P.; Wildmann, J. S.; Martin-Sanchez, J.; Fromherz, T.; Zallo, E.; Humlicek, J.; Rastelli, A.; Trotta, R.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 96:4(2017). [10.1103/PhysRevB.96.045414]

Inversion of the exciton built-in dipole moment in In(Ga)As quantum dots via nonlinear piezoelectric effect

Trotta R.
2017

Abstract

We show that anisotropic biaxial stress can be used to tune the built-in dipole moment of excitons confined in In(Ga)As quantum dots up to complete erasure of its magnitude and inversion of its sign. We demonstrate that this phenomenon is due to piezoelectricity. We present a model to calculate the applied stress, taking advantage of the so-called piezotronic effect, which produces significant changes in the current-voltage characteristics of the strained diode-membranes containing the quantum dots. Finally, self-consistent k·p calculations reveal that the experimental findings can be only accounted for by the nonlinear piezoelectric effect, whose importance in quantum dot physics has been theoretically recognized although it has proven difficult to single out experimentally.
2017
Anisotropic biaxial stress; quantum dots; piezoelectricity
01 Pubblicazione su rivista::01a Articolo in rivista
Inversion of the exciton built-in dipole moment in In(Ga)As quantum dots via nonlinear piezoelectric effect / Aberl, J.; Klenovsky, P.; Wildmann, J. S.; Martin-Sanchez, J.; Fromherz, T.; Zallo, E.; Humlicek, J.; Rastelli, A.; Trotta, R.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 96:4(2017). [10.1103/PhysRevB.96.045414]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1091824
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