Dr Paul Warburton

Biography

• Intrinsic Josephson junctions
• Quantum fluctuations in Josephson junctions
• Nanoscale amorphous superconductors
• Zinc oxide nanocrystals
• Focussed-ion-beam nanofabrication and characterisation techniques

Research interests

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.

Other activities

Paul Warburton runs the EPSRC facility for focussed-ion-beam nanofabrication based at UCL. He teaches on the MSc course in Nanotechnology and other courses within the EE department at UCL.

Recent publications

"Plasmon-Enhanced Sub-Wavelength Laser Ablation: Plasmonic Nanojets"  Adv. Mater., 24: OP29–OP35. doi: 10.1002/adma.201103807

See Research Highlight - Nanoscale “bouncing” gold droplets

 "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)

Biography

• 2004: Senior Lecturer in LCN and EE at UCL
• 2001: Lecturer in EE at UCL
• 1995: Lecturer in EE at King’s College London
• 1994: Post-doc in Physics at University of Maryland
• 1994: PhD in Materials Science at University of Cambridge
• 1990: BA in Electrical and Information Sciences at University of Cambridge

Research
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.