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Título: | Optical emission from a charge-tunable quantum ring |
Autor: | Warburton, Richard J.; Schäflein, C.; Haft, Dirk; Bickel, F.; Lorke, Axel; Karrai, Khaled; García Martínez, Jorge Manuel CSIC ORCID CVN ; Schoenfeld, W. V.; Petroff, Pierre M. | Fecha de publicación: | 22-jun-2000 | Editor: | Nature Publishing Group | Citación: | Nature 405: 926-929 (2000) | Resumen: | Quantum 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. | Descripción: | 4 páginas, 4 figuras. | Versión del editor: | http://dx.doi.org/10.1038/35016030 | URI: | http://hdl.handle.net/10261/32146 | DOI: | 10.1038/35016030 | ISSN: | 0028-0836 |
Aparece en las colecciones: | (IMN-CNM) Artículos |
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nature_405_926_2000_pre.pdf | 371,62 kB | Adobe PDF | Visualizar/Abrir |
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