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  • 1
    Digitale Medien
    Digitale Medien
    In-plane gate single-electron transistor in Ga[Al]As fabricated by scanning probe lithography (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2452-2454 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A single-electron transistor has been realized in a Ga[Al]As heterostructure by oxidizing lines in the GaAs cap layer with an atomic force microscope. The oxide lines define the boundaries of the quantum dot, the in-plane gate electrodes, and the contacts of the dot to source and drain. Both the number of electrons in the dot as well as its coupling to the leads can be tuned with an additional, homogeneous top gate electrode. Pronounced Coulomb blockade oscillations are observed as a function of voltages applied to different gates. We find that, for positive top-gate voltages, the lithographic pattern is transferred with high accuracy to the electron gas. Furthermore, the dot shape does not change significantly when in-plane voltages are tuned. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.125045
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  • 2
    Digitale Medien
    Digitale Medien
    Fabricating tunable semiconductor devices with an atomic force microscope (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1134-1136 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We fabricated quantum wires of different geometries in Ga[Al]As heterostructures by local oxidation of the semiconductor surface with an atomic force microscope. By magnetotransport measurements at low temperatures on these wires the electronic width is determined and compared to the geometrical width. An extremely small lateral depletion length of the order of 15 nm and a high specularity of the scattering at the confining walls is found. Furthermore, we demonstrate experimentally that these quantum wires can be tuned by a combination of in-plane gates and top gates. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.124620
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  • 3
    Digitale Medien
    Digitale Medien
    Energy spectra of quantum rings (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 413 (2001), S. 822-825 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Quantum mechanical experiments in ring geometries have long fascinated physicists. Open rings connected to leads, for example, allow the observation of the Aharonov–Bohm effect, one of the best examples of quantum mechanical phase coherence. The phase coherence of electrons travelling ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/35101552
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  • 4
    Digitale Medien
    Digitale Medien
    In-plane Gate Single Electron Transistor Fabricated by AFM Lithography (2000)
    Springer
    Journal of low temperature physics 118 (2000), S. 333-342 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Coulomb blockade is observed in semiconductor quantum dotsfabricated by scanning probe lithography. We demonstrate thatby combining top gates with in-plane gates, the lithographicshape of a dot can be transferred into the electron gas withhigh accuracy. Furthermore, by applying voltages to the in-plane gates, the number of electrons on the dot can be changedby more than 70 without changing its shape. Transportmeasurements in high magnetic fields and with positive topgate voltages applied indicate that the potential walls of thenanostructure can be made very steep.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004685715921
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