Graphene's band dispersion and low energy Dirac cone in a monolayer of carbon atoms arranged in a hexagonal lattice (credit: University of Manchester)
Interactions between electrons significantly enhance the already high velocity of electrons in graphene, researchers at The University of Manchester have found.
They anticipate their findings will accelerate building graphene-based devices such as touchscreens, ultrafast transistors, and photodetectors.
The researchers used extremely high-quality graphene devices, prepared by suspending sheets of graphene in a vacuum. This eliminated most of the unwanted scattering mechanisms for electrons in graphene, enhancing the effect of electron-on-electron interaction.
This is the first effect of its kind where the interactions between electrons in graphene could be clearly seen.
The electrons in graphene behave like massless Dirac particles that appear in the electronic band structure as gapless excitations with a linear dispersion.
“The exciting physics which we have found in this particular experiment may have an immediate implementation in practical electronic devices,” said University of Manchester professor Kostya Novoselov.
Novoselov, together with Professor Francisco Guinea from Madrid, won the Nobel Prize for Physics in 2010 for “groundbreaking experiments regarding the two-dimensional material graphene.” They used Scotch tape to peel away layers of carbon from a piece of graphite, and were left with a single-atom-thick, two-dimensional film of carbon — graphene.
Ref.: D. C. Elias, et al., Dirac cones reshaped by interaction effects in suspended graphene, Nature Physics, 2011; [DOI:10.1038/nphys2049]
31 July 2011
New graphene discovery brings practical devices closer | KurzweilAI
via kurzweilai.net
19 July 2011
IBM develops 'instantaneous' memory, 100x faster than flash
Image via CrunchBase
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27 June 2011
AMP HDR camera reveals reality as never before [video] - Holy Kaw!
For the first time, the public will be able to get their hands on a video camera that takes incredibly realistic footage thanks to three sensors that collect light and then create an image without having to choose between the over- and under-exposed portions of the picture. Unfortunately, only those who signed up on AMP’s waiting list will be getting the camera when it’s released later this summer, but just to whet your appetite, here’s some video showing its impressive capabilities.
Full story at Engadget.
So real you can almost touch it.
AMP Digital Video from Mike Tocci on Vimeo.
24 June 2011
21 June 2011
19 May 2011
Article: Android conquers the world -- tough luck Apple
Android conquers the world -- tough luck Apple - Beta NewsGet #1 rated SkyGrid news app for free to follow all of your interests in real time
13 May 2011
DIOXINS
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Although dioxins are environmental contaminants, most dioxin exposure occurs through the diet, with over 95% coming through dietary intake of animal fats. Small amounts come from breathing air containing trace amounts of dioxins on particles and in vapor form, from inadvertent ingestion of soil containing dioxins, and from absorption through the skin that is in contact with air, soil, or water containing minute levels of dioxins.
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