Department of Physics



Office: 3W3.5

Tel: +44 (0) 1225 383370 


Prof Paul Coleman 


I use controllable-energy positron beams to study the surface and near-surface physical and electronic properties of solids. By measuring the Doppler broadening of annihilation radiation, information is gained on the momentum of electrons – and hence on the submicroscopic structure of the sample - as a function of depth up to a few microns below the surface. This method has found particular utility in the study of the formation, migration, aggregation and annealing of open-volume (vacancy-type) point defects in thin near-surface semiconductor structures, such as ion-implanted silicon and as-grown epilayers of compound semiconductors. A new initiative will see the development of a spin-polarised positron beam for the study of magnetic structures on the nanoscale.


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