Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2009-01-29
Physics
Condensed Matter
Other Condensed Matter
6 pages, 4 figures
Scientific paper
Excited states in single quantum dots (QDs) have been shown to be useful for spin state initialization and manipulation. For scalable quantum information processing it is necessary to have multiple spins interacting. Therefore, we present initial results from photoluminescence excitation studies of excited states in coupled quantum dots (CQDs). Due to the rich set of possible excitation and recombination possibilities, a technique for visualizing photoluminescence excitation in coupled quantum dots is discussed, by which both the interaction between the dots and the type of absorption and emission that generated the photoluminescence is easily and clearly revealed. As an example, this technique is applied to characterize the shell structure of the hole in the top dot and the results are compared with those using Level Anti-Crossing Spectroscopy (LACS).
Bracker Allan S.
Gammon Dan
Garrido Mauricio
Ramanathan Swati
Scheibner Michael
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