A Dissertation submitted to the Faculty of Science, University of the Witwatersrand,
Johannesburg, in ful lment of the requirements for the degree of Master of Science. Johannesburg 2016. / Low dimensional carbon systems are of immense interest in condensed matter physics
due to their exceptional and often startling electric and magnetic properties. In this
dissertation we consider two of these materials - graphene and nanocrystalline diamond.
The effect of synthesis parameters on the quality of graphene is examined and
it is found that controlling the partial pressure of the synthesis gases plays a critical
role in determining the quality of the sample. Superconductivity in Boron doped
nanocrystalline diamond (B-NCD) is considered and weak localisation along with a
Berezinsky-Kosterlitz-Thouless (BKT) transition is identified in the samples. Furthermore
we explore theoretically the problem of electric transport through a double quantum
dot system coupled to a nanomechanical resonator. We find resonant tunnelling
when the difference between the energy levels of the dots equals an integer multiple of
the resonator frequency, and that while initially increasing the electron phonon coupling
(g) increases the current through the sample further increase in g inhibits electric
transport through the quantum dots. / LG2017
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/21681 |
| Date | January 2016 |
| Creators | Sanders, Kirsty Gail |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | Online resource (vii, 106 leaves), application/pdf |
Page generated in 0.0019 seconds