Journal
PHYSICAL REVIEW B
Volume 83, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.161303
Keywords
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Funding
- DFG [SFB-631]
- EU
- TUM Institute for Advanced Study
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Strong electrically tunable exciton g factors are observed in individual (Ga) InAs self-assembled quantum dots and the microscopic origin of the effect is explained. Realistic eight-band k . p simulations quantitatively account for our observations, simultaneously reproducing the exciton transition energy, dc Stark shift, diamagnetic shift, and g factor tunability for model dots with the measured size and a comparatively low In composition of x(In) similar to 35% near the dot apex. We show that the observed g factor tunability is dominated by the hole, with the electron contributing only weakly. The electric-field-induced perturbation of the hole wave function is shown to impact upon the g factor via orbital angular momentum quenching, with the change of the In:Ga composition inside the envelope function playing only a minor role. Our results provide design rules for growing self-assembled quantum dots for electrical spin manipulation via electrical g factor modulation.
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