Publikationsserver der RWTH Aachen University
Wachstum und Charakterisierung von Halbleiternanostrukturen auf vorstrukturiertem Substrat
Abstract
dc:descriptionOver 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.
Degree
thesis:*- Grantor dc:publisher
- Publikationsserver der RWTH Aachen University
- Year dc:date
- 2001
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Schwarz, Axel
- Contributors dc:contributor
-
- Lüth, Hans
Subjects
dc:subject × 2Rights
dc:rights- Statement dc:rights
-
- info:eu-repo/semantics/openAccess
- Language dc:language
- ger