The Nobel Prize in Physics 2010
Photo: U. Montan
Andre Geim
Photo: U. Montan
Konstantin Novoselov
The Nobel Prize in Physics 2010 was awarded jointly to Andre
Geim and Konstantin Novoselov "for
groundbreaking experiments regarding the two-dimensional
material graphene"
Graphene � the perfect atomic lattice
Graphene is a form of carbon. As a material it is
completely new � not only the thinnest ever but also the
strongest. As a conductor of electricity it performs as well as
copper. As a conductor of heat it outperforms good conducting
metals such as silver and copper. It is almost completely
transparent, yet so dense that not even the smallest gas atoms
can pass through it. It is so strong that a 1 m2 hammock,
no heavier than a cat�s whisker, could bear the weight of an
average sized cat without breaking.
In a world of paradoxes
Andre Geim and Konstantin Novoselov used a piece of graphene no
thicker than the diameter of a hair in order to investigate the
miraculous traits of graphene. The most remarkable is that
electrons travelling in graphene behave as if they did not have
any mass and move ahead at a constant speed of one thousand
kilometersper second. This opens up the possibility of studying
certain phenomena more easily on a smaller scale, i.e. without
the use of a large particle accelerator.
Graphene also allows scientists to test for some of the more
ghost-like quantum effects that have so far only been discussed
theoretically. One such phenomenon is a variant of Klein
tunnelling, which was formulated by the Swedish physicist Oskar
Klein in 1929. This tunnel effect in quantum physics describes
how particles can sometimes pass through a barrier that would
normally block them – the larger the barrier the smaller the
chance of quantum particles passing through. However, this does
not apply to electrons travelling in graphene – in some
circumstances they move ahead as if the barrier did not even
exist.
Dream worlds
So far, most of the possible practical applications for graphene
exist only in our fantasies. A great deal of interest has been
spurred by graphene’s conducting ability. Thus graphene
transistors are predicted to be substantially faster than those
made out of silicon today. Maybe we are on the verge of yet
another miniaturization of electronics that will lead to
computers becoming even more efficient in the future.
Since graphene is practically transparent (up to nearly 98%)
whilst being able to conduct electricity, it would be suitable
for the production of transparent touch screens, light panels
and maybe solar cells. Also plastics could be made into
electronic conductors if only 1% of graphene were mixed into
them. Likewise, by mixing in just a fraction of a per mille of
graphene, the heat resistance of plastics would increase by 30˚
C while at the same time making them more mechanically robust.
This resilience could be utilised in new super strong materials,
which are also thin, elastic and lightweight.
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