Tuning of the valence band mixing of excitons confined in GaAs/AlGaAs quantum dots via piezoelectric-induced anisotropic strain

• Autoři: PLUMHOF JD.; TROTTA R.; KŘÁPEK Vlastimil; ZALLO E.; ATKINSON P.; KUMAR S.; RASTELLI A.; SCHMIDT OG.
• Rok publikování: 2013
• Druh: Článek v odborném periodiku
• Časopis / Zdroj: Physical Review B
• Fakulta / Pracoviště MU: Přírodovědecká fakulta
• www: Full Text
• Doi: http://dx.doi.org/10.1103/PhysRevB.87.075311
• Klíčová slova: SINGLE-HOLE SPIN
• Popis: This work presents an experimental method to tune the degree of heavy-hole (HH) and light-hole (LH) mixing of the ground state of quantum dots (QDs). A ferroelectric crystal is used to apply reversible anisotropic biaxial stress to thin nanomembranes, containing GaAs/AlGaAs QDs. The stress-induced modification of the QD anisotropy leads to a change of the relative intensity of the two emission lines produced by the recombination of neutral bright excitonic states. Such a change is ascribed to a variation of the degree of HH-LH mixing. At the same time the modified anisotropy produces a change of the excitonic fine structure splitting (FSS). Model calculations provide a qualitative insight into the relation between strain, HH-LH mixing, and the FSS in epitaxial GaAs/AlGaAs QDs.

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