Dynamic saturation of an intersublevel transition in self-organized InAs/In(x)A(1-x)lAs quantum dots

Abstract : We have observed a dynamic saturation of an intersublevel transition in InAs/InxAl1-xAs quantum dots related to the discrete nature of electron states using midinfrared femtosecond spectroscopy. This dynamic saturation is a consequence of the gradual filling of the discrete quantum-dot electron states due to the capture of electrons injected in the barrier. Our interpretation of the differential transmission experiments is confirmed by a comparison with a rate-equation model with the capture and intersublevel relaxation time as fit parameters yielding 10 ps and 1 ps, respectively. We discuss the mechanism responsible for these relaxation times.
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Emmanuel Peronne, F. Fossard, F. H. Julien, J. Brault, M. Gendry, et al.. Dynamic saturation of an intersublevel transition in self-organized InAs/In(x)A(1-x)lAs quantum dots. Physical Review B : Condensed matter and materials physics, American Physical Society, 2003, 67 (20), pp.205329. ⟨10.1103/PhysRevB.67.205329⟩. ⟨hal-00017616⟩

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