12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

On the orbital rehybridization in tetrahedral amorphous carbon

14 Jul 2011, 14:00


Oral Presentation Track A - Condensed Matter Physics and Material Science CMPMS1


Dr Aniekan Magnus Ukpong (University of the Witwatersrand)


The use of tetrahedral amorphous carbon thin films in bolometers depends strongly on the ability to tune its optical properties. This can be achieved by controlling the density of dangling bond defects and the disorder in the material. The pi-orbital axis vector theory is used in this study to investigate the phenomenon of rehybridization of the carbon bonding in tetrahedral amorphous carbon. It is shown that the correlated pi - pi* orbitals is locally entangled due to the competition between the on-site Coulomb interaction and the hybridization. A microscopic model is proposed for the reduction in strain in the material due to hydrogenation, based on the the sp3 – sp2 conversion reaction. It is demonstrated that the activation energy for this conversion is dependent on the Urbach energy, and therefore on the disorder. The implication of the results on the manifestation of strain in similar, carbon-based, materials is discussed.

Level (Hons, MSc, <br> &nbsp; PhD, other)? Other
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? Yes
Consider for a student <br> &nbsp; award (Yes / No)? No

Primary author

Dr Aniekan Magnus Ukpong (University of the Witwatersrand)

Presentation Materials