Paul Warburton is an experimentalist working on the electronic properties of nanoscale devices. His particular interest is in the quantum properties of nanoscale Josephson junctions and other superconducting devices. His research group makes extensive use of focussed ion-beam nanofabrication. We have used this to do experiments with, for example, semiconducting nanocrystals and carbon nanotubes.
A zinc oxide tetrapod (SEM image by Marcus Newton)
SEM image of an array of ~ 100 intrinsic Josephson junctions in a thin film of an oxide high-temperature superconductor. Each Josephson junction is 1.7 nm thick, so cannot be individually resolved in this image. The structure was fabricated using focussed-ion-beam milling.
"Plasmon-Enhanced Sub-Wavelength Laser Ablation: Plasmonic Nanojets" Adv. Mater., 24: OP29–OP35. doi: 10.1002/adma.201103807
"Low-current focused-ion-beam induced deposition of three-dimensional tungsten nanoscale conductors" [PDF File] W. Li, P. A. Warburton. Nanotechnology 18 485305 (2007)
"ZnO tetrapod Schottky photodiodes" [PDF File] M. C. Newton, S. Firth, P. A. Warburton. Appl. Phys. Lett. 89, 072104 (2006)
"Josephson fluxon flow and phase diffusion in thin-film intrinsic Josephson junctions" [PDF File] P. A. Warburton, A. R. Kuzhakhmetov, O. S. Chana, G. Burnell, M. G. Blamire, H. Schneidewind, Y. Koval, A. Franz, P. Mueller, D. M. C. Hyland, D. Dew-Hughes, H. Wu and C. R. M. Grovenor. J. Appl. Phys. 95, 4941 (2004)