Impact of ex-situ rapid thermal annealing on the magneto-optical properties and the oscillator strength of In(Ga)As quantum dots
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We discuss the influence of a rapid thermal annealing step on the magneto-optical emission properties of In(Ga)As/GaAs quantum dots. We map out a strong influence of the growth- and anneling parameters on the quantum excitons' effective Land\'e g-factors and in particular on their diamagnetic coefficients, which we directly correlate with the modification of the emitters shape and material composition. In addition, we study the excitons' spontaneous emission lifetime as a function of the annealing temperature and the dot height, and observe a strong increase of the emission rate with the quantum dot volume. The corresponding increase in oscillator strenth yields fully consistent results with the analysis of the diamagenic behavior. In particular, we demonstrate that a rapid thermal annealing step of 850ºC can be employed to increase the oscillator strength of as-grown InAs/GaAs QDs by more than a factor of 2.
Braun , T , Betzold , S , Lundt , N , Kamp , M , Höfling , S & Schneider , C 2016 , ' Impact of ex-situ rapid thermal annealing on the magneto-optical properties and the oscillator strength of In(Ga)As quantum dots ' Physical Review. B, Condensed matter and materials physics , vol 93 , no. 15 , 155307 . DOI: 10.1103/PhysRevB.93.155307
Physical Review. B, Condensed matter and materials physics
© 2016 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://dx.doi.org/10.1103/PhysRevB.93.155307
The authors acknowledge financial support by the State of Bavaria and the German Ministry of Education and Research (BMBF) within the project Q.com-HL.
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