Physicists discover novel electronic properties in 2D carbon structureOctober 15th, 2009 - 4:02 pm ICT by ANI
Washington, October 15 (ANI): Researchers have discovered novel electronic properties in two-dimensional sheets of carbon atoms called graphene that could one day be the heart of speedy and powerful electronic devices.
The new findings, by researchers at Rutgers, the State University of New Jersey, show that electrons in graphene can interact strongly with each other.
The behavior is similar to superconductivity observed in some metals and complex materials, marked by the flow of electric current with no resistance and other unusual but potentially useful properties.
In graphene, this behavior results in a new liquid-like phase of matter consisting of fractionally charged quasi-particles, in which charge is transported with no dissipation.
Physics professor Eva Andrei and her Rutgers colleagues note that the strong interaction between electrons, also called correlated behavior, had not been observed in graphene in spite of many attempts to coax it out.
This led some scientists to question whether correlated behavior could even be possible in graphene, where the electrons are massless (ultra-relativistic) particles like photons and neutrinos.
In most materials, electrons are particles that have mass.
“Our work demonstrated that earlier failures to observe correlated behavior were not due to the physical nature of graphene,” said Eva Andrei, physics professor in the Rutgers School of Arts and Sciences.
“Rather, it was because of interference from the material which supported graphene samples and the type of electrical probes used to study it,” she added.
This finding should encourage scientists to further pursue graphene and related materials for future electronic applications, including replacements for today’s silicon-based semiconductor materials.
The Rutgers physicists further observed the collective behavior of the ultra-relativistic charge carriers in graphene through a phenomenon known as the fractional quantum Hall effect (FQHE).
The FQHE is seen when charge carriers are confined to moving in a two-dimensional plane and are subject to a perpendicular magnetic field.
The FHQE is known to exist in semiconductor-based, two-dimensional electron systems, where the electrons are massive particles that obey conventional dynamics versus the relativistic dynamics of massless particles.
However, it was not obvious until now that ultra-relativistic electrons in graphene would be capable of exhibiting collective phenomena that give rise to the FHQE.
The Rutgers physicists were surprised that the FHQE in graphene is even more robust than in standard semiconductors. (ANI)
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Tags: behavior results, carbon atoms, carbon structure, charge carriers, collective behavior, complex materials, electrical probes, electronic applications, electronic properties, electrons, graphene, neutrinos, new liquid, physical nature, physics professor, relativistic particles, rutgers school, rutgers the state university of new jersey, semiconductor materials, strong interaction