Abstract
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. © 2005 The American Physical Society.
Original language | English |
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Article number | 195339 |
Pages (from-to) | 1-6 |
Number of pages | 6 |
Journal | Physical Review B: Condensed Matter and Materials Physics |
Volume | 72 |
Issue number | 19 |
DOIs | |
Publication status | Published - 15 Nov 2005 |