Abstract
We discuss recent developments in the techniques to investigate very well defined one-dimensional quantum wires and extremely small zero-dimensional quantum dots in which the electron density can be controlled with field electrodes. The electron systems are induced in especially designed metal insulator semiconductor (MIS-type) heterojunctions that contain no do** in the front barrier but instead a highly doped back electrode buried beneath the heterojunction interface. One-dimensional electron wires of very high quality are generated in GaAs/AlAs MIS-type heterostructures with so-called interdigitated electrodes, which allow us to control almost independently the confinement potential and electron density. Very small zero-dimensional electron dots with a diameter of typically 20 nm are prepared on InGaAs/GaAs heterostructures in the Stranski-Krastanov growth modus. Capacitance as well as far-infrared measurements are presented that directly reflect the special properties of one- and zero-dimensional electron systems.
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© 1996 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH
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Hansen, W., Drexler, H. (1996). Spectroscopy on field-effect induced quantum wires and quantum dots. In: Helbig, R. (eds) Advances in Solid State Physics 35. Advances in Solid State Physics, vol 35. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0107541
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