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'Graphene earns its stripes': New nanoscale electronic state discovered on graphene sheets

Date:
December 5, 2011
Source:
University College London - UCL
Summary:
Researchers 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.
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Electronic stripes, called ‘charge density waves’, on the surface of a graphitic superconductor.
Credit: K.A. Rahnejat

Researchers from the London Centre for Nanotechnology (LCN) 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, 29th November.

Graphene is a material made up of a single sheet of carbon atoms just 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.


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The above post is reprinted from materials provided by University College London - UCL. Note: Materials may be edited for content and length.


Journal Reference:

  1. K.C. Rahnejat, C.A. Howard, N.E. Shuttleworth, S.R. Schofield, K. Iwaya, C.F. Hirjibehedin, Ch. Renner, G. Aeppli, M. Ellerby. Charge density waves in the graphene sheets of the superconductor CaC6. Nature Communications, 2011; 2: 558 DOI: 10.1038/ncomms1574

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University College London - UCL. "'Graphene earns its stripes': New nanoscale electronic state discovered on graphene sheets." ScienceDaily. ScienceDaily, 5 December 2011. <www.sciencedaily.com/releases/2011/11/111129112125.htm>.
University College London - UCL. (2011, December 5). 'Graphene earns its stripes': New nanoscale electronic state discovered on graphene sheets. ScienceDaily. Retrieved July 3, 2015 from www.sciencedaily.com/releases/2011/11/111129112125.htm
University College London - UCL. "'Graphene earns its stripes': New nanoscale electronic state discovered on graphene sheets." ScienceDaily. www.sciencedaily.com/releases/2011/11/111129112125.htm (accessed July 3, 2015).

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