SP Hepplestone's Former Research Interests
In 2004 and 2005 I carried out a series of lattice dynamical
calculations for the phonon dispersion relations for Silicon
nanostructures. These approaches were based upon the Adiabatic
Bond Charge Mdoel which has been successfully employed to model
several other systems. These results in particular studied the
behaviour of two zone-center modes, the highest optical mode and the
lowest non-zero mode, called the sigma mode. Using a unified
technique it was possible to investigate the behaviour of phonon modes
in several different types of nanostructure that silicon may form and
draw out key differences and simularities. Further information is
available within my publications.
Previously I have studied the tunnelling of electrons in a single and
double potential barrier systems. This approach was based upon the
Transfer Matrix Method. It was submitted as part of my master's project
for my degree of MPhys (Master Of Physics).