Electrical transport in Graphene nanoribbons (physics)
Graphene nanoribbons (GNRs) are quasi one-dimensional systems based on graphene. The electronic behaviour of these nanostructures is determined by their geometric confinement and so may be seen as systems in which to study quantum effects. The electronic behaviour of GNRs can be manipulated by the application of external fields to the structure or by changing the geometric confinement structurally. The ability to do this is what gives GNRs great potential for use in technological applications such as graphene-based molecular sensor devices and nanotransistors. One important feature of the transport properties of these quasi one-dimensional
systems is the resonant tunnelling which has been reported that in S- and U-shaped ribbons. Resonant tunneling can also be seen in graphene nanoring structures in the presence of external magnetic field. These annular structures show resonance in the conductance at defined energies, which can be tuned by gate potentials, the intensity of the magnetic field or by modifying their geometry.
In this project we propose to undertake a theoretical/computational study of the transport properties of GNR-based conductors composed of two finite and parallel armchair nanoribbons (A-GNRs) connected to electrodes. We will focus on the determining the electronic band structure and conductivity of these GNRs using density functional theory (DFT) as well as the semi-empirical extended Huckel theory
within the framework of non-equilibrium Greens function (NEGF) theory. In addition, the response of the system to external electric and magnetic fields will be examined.
This project is available to students applying for funded PhD studentships and may be altered or withdrawn.
Studentships will be awarded to successful applicants from all applications received. Applicants must satisfy RCUK residency rules for the full studentship.
How good is research at Cardiff University in Physics?
FTE Category A staff submitted: 19.50
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