Phys. Rev. B 67, 205329 (2003) [4 pages]Dynamic saturation of an intersublevel transition in self-organized InAs/InxAl1-xAs quantum dotsReceived 10 February 2003; published 30 May 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.205329
DOI:
10.1103/PhysRevB.67.205329
PACS:
78.47.+p, 73.21.La
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