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Optical emission from a charge-tunable quantum ring

AuthorsWarburton, Richard J.; Schäflein, C.; Haft, Dirk; Bickel, F.; Lorke, Axel; Karrai, Khaled; García Martínez, Jorge Manuel ; Schoenfeld, W. V.; Petroff, Pierre M.
Issue Date22-Jun-2000
PublisherNature Publishing Group
CitationNature 405: 926-929 (2000)
AbstractQuantum dots or rings are artificial nanometre-sized clusters that confine electrons in all three directions. They can be fabricated in a semiconductor system by embedding an island of low-bandgap material in a sea of material with a higher bandgap. Quantum dots are often referred to as artificial atoms because, when filled sequentially with electrons, the charging energies are pronounced for particular electron numbers1, 2, 3; this is analogous to Hund's rules in atomic physics. But semiconductors also have a valence band with strong optical transitions to the conduction band. These transitions are the basis for the application of quantum dots as laser emitters4, storage devices5, 6, 7 and fluorescence markers8. Here we report how the optical emission (photoluminescence) of a single quantum ring changes as electrons are added one-by-one. We find that the emission energy changes abruptly whenever an electron is added to the artificial atom, and that the sizes of the jumps reveal a shell structure.
Description4 páginas, 4 figuras.
Publisher version (URL)http://dx.doi.org/10.1038/35016030
Appears in Collections:(IMN-CNM) Artículos
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