Department of Physics

paul_coleman

Professor

Office: 3W3.5

Tel: +44 (0) 1225 383370 

 

Prof Paul Coleman 

Profile

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.

Publications

Townrow, S. and Coleman, P. G., 2014. Structure and sublimation of water ice films grown in vacuo at 120-190 K studied by positron and positronium annihilation. Journal of Physics: Condensed Matter, 26 (12), 125402.

Edwardson, C. J., Coleman, P. G. and El Mubarek, H. A. W., 2014. Positron annihilation studies of fluorine-vacancy complexes in phosphorus- and fluorine-implanted germanium. Semiconductor Science and Technology, 29 (3), 035005.

Romanenko, A., Edwardson, C. J., Coleman, P. G. and Simpson, P. J., 2013. The effect of vacancies on the microwave surface resistance of niobium revealed by positron annihilation spectroscopy. Applied Physics Letters, 102 (23), 232601.

Edwardson, C. J., Coleman, P. G., Paez, D. J., Doylend, J. K. and Knights, A. P., 2013. Direct observation of electron capture and reemission by the divacancy via charge transient positron spectroscopy. Physical Review Letters, 110 (13), 136401.

Coleman, P., 2013. Positronium formation in methanol and ethanol. Physical Review A - Atomic, Molecular, and Optical Physics, 87 (1), 012712.

Townrow, S., Coleman, P.G., Wu, Y.C., Jiang, J. and Wang, S.J., 2013. Observations of the growth and sublimation of water ice films by variable-energy positron annihilation spectroscopy. Journal of Physics: Conference Series, 443 (1), 012058.

Archer, J., Trilov, S.M. and Coleman, P.G., 2013. Positronium formation in molecular oxygen. Journal of Physics: Conference Series, 443 (1), 012001.

Coleman, P. G., Edwardson, C. J., Zhang, A., Ma, X., Pi, X. and Yang, D., 2012. Defects in TiO 2 films on p +-Si studied by positron annihilation spectroscopy. Materials Science & Engineering B - Solid State Materials for Advanced Technology, 177 (8), pp. 625-628.

Coleman, P. G., Edwardson, C. J., Knights, A. P. and Gwilliam, R. M., 2012. Vacancy-type defects created by single-shot and chain ion implantation of silicon. New Journal of Physics, 14, 025007.

Edwardson, C. J., Coleman, P. G., El Mubarek, H. A. W. and Gandy, A. S., 2012. Positron annihilation studies of fluorine-vacancy complexes in Si and SiGe. Journal of Applied Physics, 111 (7), 073510.

Wu, Y. C., Zhai, T. and Coleman, P. G., 2012. A positron annihilation study of corrosion of aluminum and aluminum alloy by NaOH. Metallurgical and Materials Transactions A, 43 (8), pp. 2823-2831.

Edwardson, C. J., Coleman, P. G., Li, T. T. A., Cuevas, A. and Ruffell, S., 2012. Positron annihilation studies of the AlO xSiO 2Si interface in solar cell structures. Journal of Applied Physics, 111 (5), 053515.

Wu, Y. C., Jiang, J., Wang, S. J., Kallis, A. and Coleman, P. G., 2011. Porosity and crystallization of water ice films studied by positron and positronium annihilation. Physical Review B, 84 (6), 064123.

Thornton, M. J. and Coleman, P. G., 2011. Energy dependence of the positronium formation cross-section in argon. Journal of Physics B: Atomic Molecular and Optical Physics, 44 (14), 145201.

Coleman, P. G., Nash, D., Edwardson, C. J., Knights, A. P. and Gwilliam, R. M., 2011. The evolution of vacancy-type defects in silicon-on-insulator structures studied by positron annihilation spectroscopy. Journal of Applied Physics, 110 (1), 016104.

Coleman, P. G., 2011. Activation energies for vacancy migration, clustering and annealing in silicon. Journal of Physics: Conference Series, 265 (1), 012001.

Wu, Y. C., Li, P. H., Xue, X. D., Wang, S. J., Kallis, A., Coleman, P. G. and Zhai, T., 2011. Corrosion of pure aluminium and aluminium alloy: A comparative study using a slow positron beam. Journal of Physics: Conference Series, 262 (1), 012065.

Coleman, P. G. and Kallis, A., 2011. Development of a spin-polarised positron beam. Journal of Physics: Conference Series, 262 (1), 012016.

Coleman, P. G., 2011. Ice and atoms: Experiments with laboratory-based positron beams. Journal of Physics: Conference Series, 262 (1), 012015.

Edwardson, C. J., Grogan, M. D. W., Birks, T. A. and Coleman, P. G., 2011. Positron and positronium studies of silica aerogel. Journal of Physics: Conference Series, 262 (1), 012018.

Knights, A. P., Bradley, J. D. B., Hulko, O., Stevanovic, D. V., Edwards, C. J., Kallis, A., Coleman, P. G., Crowe, I. F., Halsall, M. P. and Gwilliam, R. M., 2011. Probing the formation of silicon nano-crystals (Si-ncs) using variable energy positron annihilation spectroscopy. Journal of Physics: Conference Series, 262 (1), 012031.

Wu, Y. C., Kallis, A., Jiang, J. and Coleman, P. G., 2010. Structural and phase changes in amorphous solid water films revealed by positron beam spectroscopy. Physical Review Letters, 105 (6), 066103.

Jay, P. M. and Coleman, P. G., 2010. Coupling between positronium formation and elastic positron-scattering channels in the rare gases. Physical Review A - Atomic, Molecular, and Optical Physics, 82 (1), 012701.

Zhang, Y., Ma, X., Chen, P., Li, D., Pi, X., Yang, D. and Coleman, P. G., 2009. Enhancement of electroluminescence from TiO[sub 2]/p[sup +]-Si heterostructure-based devices through engineering of oxygen vacancies in TiO[sub 2]. Applied Physics Letters, 95 (25), 252102.

Smith, A. J., Gwilliam, R. M., Stolojan, V., Knights, A. P., Coleman, P. G., Kallis, A. and Yeong, S. H., 2009. Enhancement of phosphorus activation in vacancy engineered thin silicon-on-insulator substrates. Journal of Applied Physics, 106 (10), 103514.

Coleman, P. G., 2009. Positron Spectroscopy. In: Andrews, D. L., ed. Encyclopedia of Applied Spectroscopy. Chichester: Wiley-VCH, pp. 115-152.

Coleman, P. G., Cheesman, N. and Lowry, E. R., 2009. Coupling between positron-atom scattering channels above the first inelastic threshold. Physical Review Letters, 102 (17), 173201.

Coleman, P. and POTTER, N., 2008. Back to the future: Polarised positron beams. Applied Surface Science, 255 (1), pp. 101-103.

Coleman, P. and Abdulmalik, D., 2008. Useful vacancies: Positron beam interrogation of fluorine-vacancy complexes in semiconductor device structures. Applied Surface Science, 255 (1), pp. 71-74.

Knights, A., Dudeck, K., Walters, W. and Coleman, P., 2008. Modification of silicon waveguide structures using ion implantation induced defects. Applied Surface Science, 255 (1), pp. 75-77.

Abdulmalik, D. and Coleman, P. G., 2008. Activation energies for the formation and evaporation of vacancy clusters in silicon. Physical Review Letters, 100 (9), 095503.

Dudeck, K. J., Walters, W. D., Knights, A. P. and Coleman, P., 2008. Observation of vacancy defects at silicon grain boundaries formed via suppressed solid phase epitaxy. Journal of Physics D: Applied Physics, 41 (5), 055102.

This list was generated on Tue Jul 22 00:04:10 2014 IST.

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