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Superelastic Electrons Are Found In Graphene
Sep 07, 2017

China energy storage net news: physicists network 23 reported that due to the successful preparation of single atomic layer thickness of graphene and won the Nobel Prize for physics, Andre geim team observed movement behavior of electrons in graphene violate common sense and conduction mechanism, and expounds the new understanding of the physics properties of conductive materials.The results are published in the latest issue of nature physics.

Graphene conducts electricity better than copper, in part because of its unique two-dimensional structure.In most metals, conductivity is limited by crystal defects, and when electrons pass through the material, they scatter as frequently as billiards.In the theory of nano-electronic transport, the description of such elastic electron scattering characteristics by randol-butik's formula shows that the normal conductive material should improve the conductivity and face strict limitations.

But the latest results from the research team at the university of Manchester, led by haim, suggest that this basic constraint may be broken in graphene materials.Experimental observations at the UK's national graphene institute provide a basic understanding of the special behaviour of the electron flow in graphene.Experiments on three different teams, including the university of Manchester, show that at certain temperatures, electrons collide with each other and begin to flow as often as viscous liquid.

Haim said: "the textbook says, additional obstacles always generate additional resistance, but in this case, with the increase of temperature, electron scattering caused by disorder actually reduces the resistance, electronic like liquid flow rate was faster than free spread in a vacuum, this unique phenomenon defies intuition!"

The usual scattering of events reduces the conductivity of the material, but this observation subverts common sense -- some electrons are stuck near the edge of the graphene crystal, whose kinetic energy dissipation is the highest and is the slowest.At the same time, they protect the nearby electronic collision from these areas, lead to other electronic, thanks to these "friends" help become super good elasticity and flowing smoothly, conduction performance.

More importantly, through studies how resistance change with temperature, scientists have discovered a new physical quantity -- sticky conductance, repeated testing and qualitative research, is very beneficial to guide future nanoscale electronic circuit design, is conducive to a deep understanding of graphene materials.


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