Dokument: Classical electron magnetotransport in controlled potential landscapes
| Titel: | Classical electron magnetotransport in controlled potential landscapes | |||||||
| URL für Lesezeichen: | https://docserv.uni-duesseldorf.de/servlets/DocumentServlet?id=46295 | |||||||
| URN (NBN): | urn:nbn:de:hbz:061-20180628-110642-4 | |||||||
| Kollektion: | Dissertationen | |||||||
| Sprache: | Englisch | |||||||
| Dokumententyp: | Wissenschaftliche Abschlussarbeiten » Dissertation | |||||||
| Medientyp: | Text | |||||||
| Autor: | Schluck, Jakob [Autor] | |||||||
| Dateien: |
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| Beitragende: | Prof. Dr. Heinzel, Thomas [Betreuer/Doktorvater] Prof. Dr. Horbach, Jürgen [Gutachter] Prof. Dr. Ensslin, Klaus [Gutachter] | |||||||
| Dewey Dezimal-Klassifikation: | 500 Naturwissenschaften und Mathematik » 530 Physik | |||||||
| Beschreibung: | This thesis deals with classical two-dimensional electron transport in artificial potential landscapes. The starting point is the two-dimensional electron gas in modulation doped high-mobility GaAs/AlxGa1−xAs heterostructures.
First we studied magnetic fields localized on a sub-micron scale, so-called magnetic barriers. We could demonstrate how a measurement of the magnetization via conventional Hall magnetometry of such a structure can be hampered by a ballistic effect. With the help of numerical simulations, the correct magnetization trace could be recovered. By adding a homogeneous background magnetic field with anti-parallel orientation to the barrier, we could experimentally observe resistance oscillations. Their origin is traced back to commensurate snake trajectories by quantum mechanical simulations. The second part of the thesis treats aspects of electron transport in periodically modulated potentials, so-called lateral superlattices. We studied antidot lattices, two-dimensional arrangements of circular depletion zones, in a regime where quantum oscillations are superimposed to the classical commensurabilities. For the first time, we find the coexistence of quantum signatures of band- and hopping transport in the same resistivity component. Furthermore, a novel magneto-electric hybrid lattice, a combination of a square antidot lattice with a one-dimensional magnetic superlattice comprised of magnetic barriers with alternating direction, was studied. By tuning the magnetization, we find resistance oscillations, whose minima are linked to the existence of classical snake trajectories that are commensurate with the antidot lattice. In the last part we consider so-called classical Lorentzgases. This model describes the scattering of electrons in solids on the basis of randomly placed short-ranged scatterers. Due to the high mobility of our heterostructure, we could artificially introduce such scatterers in the classical regime into the material and study their effect on transport. For the first time we could unambiguously demonstrate the existence of a maximum in magnetoconductivity and discuss its origin. Finally we deal with the dependence of the magnetoresistivity on the shape of the scatterers for the regime of low magnetic fields. | |||||||
| Lizenz: |  Urheberrechtsschutz | |||||||
| Fachbereich / Einrichtung: | Mathematisch- Naturwissenschaftliche Fakultät » WE Physik » Physik der kondensierten Materie | |||||||
| Dokument erstellt am: | 28.06.2018 | |||||||
| Dateien geändert am: | 28.06.2018 | |||||||
| Promotionsantrag am: | 02.03.2018 | |||||||
| Datum der Promotion: | 14.06.2018 |
