webleads-tracker

Home  >  NANOMATERIALS  > Graphene earns its stripes...
  >  NANOMATERIALS TECHNO
Nov 30th, 2011
 
Graphene earns its stripes
 
New nanoscale electronic state discovered on graphene sheets
Send to a friend
Charge density waves, on the surface of the graphene sheets.
Charge density waves, on the surface of the graphene sheets.

Researchers from the London Centre for Nanotechnology have discovered electronic stripes, called ‘charge density waves', on the surface of the graphene sheets that make up a graphitic superconductor. This is the first time these stripes have been seen on graphene, and the finding is likely to have profound implications for the exploitation of this recently discovered material, which scientists believe will play a key role in the future of nanotechnology. The discovery is reported in Nature Communications.

Graphene is a material made up of a single sheet of carbon atoms only one atom thick, and is found in the marks made by a graphite pencil. Graphene has remarkable physical properties and therefore has great technological potential, for example, in transparent electrodes for flat screen TVs, in fast energy-efficient transistors, and in ultra-strong composite materials. Scientists are now devoting huge efforts to understand and control the properties of this material.

The LCN team donated extra electrons to a graphene surface by sliding calcium metal atoms underneath it. One would normally expect these additional electrons to spread out evenly on the graphene surface, just as oil spreads out on water. But by using an instrument known as a scanning tunneling microscope, which can image individual atoms, the researchers have found that the extra electrons arrange themselves spontaneously into nanometer-scale stripes. This unexpected behavior demonstrates that the electrons can have a life of their own which is not connected directly to the underlying atoms. The results inspire many new directions for both science and technology. For example, they suggest a new method for manipulating and encoding information, where binary zeros and ones correspond to stripes running from north to south and running from east to west respectively.

This work is part of an ongoing multi-disciplinary research effort into graphene at the LCN, and follows on from the original discovery of superconductivity in the graphite superconductor CaC6 by Weller at al. published in Nature Physics, doi:10.1038/nphys0010.

Professor Jan Zaanen of Leiden University and winner of the prestigious Spinoza prize for, among other things, his role as proponent of the stripe concept for atomically thin materials, commented that "This discovery is another important step towards demonstrating the ubiquity of stripes, and the fact that they appear in the world's simplest host - the two-dimensional network of carbon atoms that is graphene - means that more great science and applications are not far behind."


 
More NANOMATERIALS TECHNO news

Jun 27th
May 5th
Mar 31st
Mar 31st
Mar 14th
 
©2007 Yole Developpement All rights reserved                  Disclaimer | Legal notice | To advertise
Yole Développement: Le Quartz, 75 cours Emile Zola, 69100 Villeurbanne, France. TEL: (33) 472 83 01 80 FAX: (33) 472 83 01 83 E-Mail: info @yole.fr