Dr Paul Warburton

tel: +44 (0)20 7679 3971
ext: 33971
fax: +44 (0)20 7679 0595
office:

2C2

Research interests:

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

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
External positions held: 

Paul Warburton runs the EPSRC facility for focussed-ion-beam nanofabrication based at UCL.

Research: 

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.

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.

Recent publications

"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)

Research Highlights

A quantum computer without its protective thermal canister. Kim Stallknecht for
Taken from the NY Times by Quantin Hardy  In the fight to prove it really has developed a quantum computer, D-Wave...
Electron microscope image of nanowires grown on a silicon substrate
The integration of semiconductor nanowires with conventional silicon electronics has overcome a major hurdle thanks to...
electron micrograph of the array of cross-shaped apertures in a gold film coated
Resonances occur throughout science and engineering, from guitar strings to NMR scanners. Nearly all resonances follow the...
Gold Nanoparticles
When a pebble is dropped onto the surface of a pond, a droplet of water bounces up from the surface. The same thing happens...
Freestanding Superconducting Pickup Loop.
While the Euston Arch may have been controversially demolished in the 1960s during redevelopment of Euston Station, but...
How can one increase the maximum current which can flow in a superconductor without any resistance? Counter-intuitively the...
Teaching: 

I teach on the MSc course in Nanotechnology and other courses within the EE department at UCL.