Observation and explanation of strong electrically tunable excitongfactors in composition engineered In(Ga)As quantum dots
| Autor: | JG Joris Keizer, F. Klotz, Max Bichler, Stephan Kapfinger, Jonathan J. Finley, Gerhard Abstreiter, E. C. Clark, PM Paul Koenraad, T. Eissfeller, V. Jovanov |
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| Přispěvatelé: | Photonics and Semiconductor Nanophysics, Semiconductor Nanostructures and Impurities |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Physical Review B: Condensed Matter, 83(16):161303, 161303-1/4. American Institute of Physics |
| ISSN: | 1550-235X 1098-0121 0163-1829 |
| Popis: | 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 xIn~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. |
| Databáze: | OpenAIRE |
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