{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:56757"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:56757","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Wachstum und Charakterisierung von Halbleiternanostrukturen auf vorstrukturiertem Substrat","abstract":"Over the last two decades there has been intense theoretical and experimental interest in the physics of low-dimensional electron systems which are predicted to exhibit unique electronic and optical properties. The reduced phase space available for electron scattering in one-dimensional systems – so called quantum wires – is expected to lead to a greatly enhanced mobility. Furthermore Fermi liquid behavior is predicted to give way to Luttinger liquid behavior due to strong electron correlation while electron-hole interaction should manifest in Fermi edge singularities to be observed in photoluminescence spectra. This thesis reports the successful preparation of high quality quantum wires by epitaxially overgrowing non-planar substrates. After discussing the basic growth mechanisms on such special surfaces, bandstructure calculations are used to help understanding the quantization properties of the resulting complex structures of interconnected three-, two- and one-dimensional areas. Cathodo- and photoluminescence experiments prove the formation of high-quality quantum wires with strong confinement potential and large subband spacing. Even the existence of Fermi edge singularities in modulation doped systems can be revealed. While magneto-transport does not show clear evidence of one-dimensional electron transport, special experiments indicate a restriction of current to the quantum wire as long the Fermi edge stays undisturbed.","abstract_html":"Over the last two decades there has been intense theoretical and experimental interest in the physics of low-dimensional electron systems which are predicted to exhibit unique electronic and optical properties. The reduced phase space available for electron scattering in one-dimensional systems – so called quantum wires – is expected to lead to a greatly enhanced mobility. Furthermore Fermi liquid behavior is predicted to give way to Luttinger liquid behavior due to strong electron correlation while electron-hole interaction should manifest in Fermi edge singularities to be observed in photoluminescence spectra. This thesis reports the successful preparation of high quality quantum wires by epitaxially overgrowing non-planar substrates. After discussing the basic growth mechanisms on such special surfaces, bandstructure calculations are used to help understanding the quantization properties of the resulting complex structures of interconnected three-, two- and one-dimensional areas. Cathodo- and photoluminescence experiments prove the formation of high-quality quantum wires with strong confinement potential and large subband spacing. Even the existence of Fermi edge singularities in modulation doped systems can be revealed. 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The reduced phase space available for electron scattering in one-dimensional systems – so called quantum wires – is expected to lead to a greatly enhanced mobility. Furthermore Fermi liquid behavior is predicted to give way to Luttinger liquid behavior due to strong electron correlation while electron-hole interaction should manifest in Fermi edge singularities to be observed in photoluminescence spectra. This thesis reports the successful preparation of high quality quantum wires by epitaxially overgrowing non-planar substrates. After discussing the basic growth mechanisms on such special surfaces, bandstructure calculations are used to help understanding the quantization properties of the resulting complex structures of interconnected three-, two- and one-dimensional areas. Cathodo- and photoluminescence experiments prove the formation of high-quality quantum wires with strong confinement potential and large subband spacing. 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