Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-03-05
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 10 figures, 2 tables, revtex
Scientific paper
Modern nanotechnology allows producing, depending on application, various quantum nanostructures with the desired properties. These properties are strongly influenced by the confinement potential which can be modified, e.g., by electrical gating. In this paper we analyze a nanostructure composed of a quantum dot surrounded by a quantum ring. We show that depending on the details of the confining potential the electron wave functions can be located in different parts of the structure. Since the properties of such a nanostructure strongly depend on the distribution of the wave functions, varying the applied gate voltage one can easily control them. In particular, we illustrate the high controllability of the nanostructure by demonstrating how its coherent, optical, and conducting properties can be drastically changed by a small modification of the confining potential.
Kurpas Marcin
Maska Maciej M.
Zipper Elzbieta
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