Absorption and photoluminescence spectroscopy on a single self-assembled charge-tunable quantum dot

Details Absorption and photoluminescence spectroscopy on a single self-assembled charge-tunable quantum dot Absorption and photoluminescence spectroscopy on a single self-assembled charge-tunable quantum dot

2005-10-27

arxiv.org/abs/cond-mat/0510728v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 6 figures

Scientific paper

10.1103/PhysRevB.72.195339

We have performed detailed photoluminescence (PL) and absorption spectroscopy on the same single self-assembled quantum dot in a charge-tunable device. The transition from neutral to charged exciton in the PL occurs at a more negative voltage than the corresponding transition in absorption. We have developed a model of the Coulomb blockade to account for this observation. At large negative bias, the absorption broadens as a result of electron and hole tunneling. We observe resonant features in this regime whenever the quantum dot hole level is resonant with two-dimensional hole states located at the capping layer-blocking barrier interface in our structure.

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