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Science 5 July 1996:
Vol. 273. no. 5271, pp. 9 - 0
DOI:

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This Week in Science

In a quantum dot, a nanometer-size semiconductor structure, exciting an electron across the band gap produces an exciton (the electron interacting with the hole left in the valence band) that is confined in three dimensions. These excitons can act like atomic states. Gammon et al. (p. 87) measured photoluminescence exciton spectra from individual gallium arsenide quantum dots and were able to measure homogeneous (nonbroadened) linewidths of these transitions, which allows exciton lifetimes and dynamics to be explored.




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