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New method for investigating the hydrodynamic behavior of electrons in graphene proposed



  New method for investigating the hydrodynamic behavior of electrons in graphene proposed
The published work paves the way for further exploration of the potential of graphene. Picture credits: Rensselaer Polytechnic Institute

Investigating how electrons in two-dimensional graphs can literally act like a liquid, researchers have paved the way for further exploration of a material that may enable future electronic computing devices that surpass silicon transistors.

Research into a new method for more accurate detection of liquid-like electron behavior in graphene, developed by Rensselaer researcher Ravishankar Sundararaman and a Quazar Technologies team in India led by Mani Chandra, was recently published in Physical Review B. , .

Graphene is a single atomic layer of graphite, which has attracted much attention due to its unique electronic properties. Recently, according to Sundararaman, scientists have suggested that electrons in graphene can flow under the right conditions like any other liquid.

To illustrate, Sundararaman compares electrons to water droplets. If only a few droplets line the bottom of a vessel, their movement is predictable as they follow the movement of the container when it is tilted laterally. This is how electrons behave in most materials when they come in contact with and bounce off atoms. This leads to Ohm's law, the observation that the electrical current flowing through a material is proportional to the voltage applied to it. Remove the voltage and the power stops.

Now imagine a glass that is half full of water. The movement of liquid, especially when shaking the vessel, is much less uniform, since the water molecules mostly come in contact with each other instead of the vessel walls, whereby the water can slosh and swirl. Even if you stop moving the glass, the movement of the water will continue. Sundararaman compares this to how the electrons continue to flow in graphene, even after the voltage has been interrupted.

Researchers had known that electrons in graphene had the potential to act in this way, but it is difficult to conduct experiments to create the necessary conditions for this behavior. Previously, Sundararaman said, scientists put tension on a material and looked for a negative resistance, but it was not a very sensitive method.

The calculations presented by Sundararaman and his team in this latest work show that tension oscillates ̵

1; mimicking the tension of jarring motions in the container example – researchers can more accurately identify and measure the generated vortices and hydrodynamic behavior of the electrons.

"That's really amazing and useful electronic features," said Sundararaman, Assistant Professor of Materials Science and Engineering. "Because it flows like a liquid, it has the potential to maintain its momentum and keep going – you could have a line with much less energy loss, which is extremely useful for making low-power devices really fast."

Sundararaman has done it It is clear that much more research needs to be done before such a device can be built and applied to electronics. But the method presented in this article, including the measurements given by the researchers, is intended to allow a closer observation of this hydrodynamic flow of electrons in graphene and other promising materials.


The Hall effect becomes viscous in graphene


Further information:
Mani Chandra et al. Hydrodynamic and Ballistic AC Transport in Two-Dimensional Fermi Liquids, Physical Review B (2019). DOI: 10.1103 / PhysRevB.99.165409

Provided by
Rensselaer Polytechnic Institute




Quote :
New method for investigating the hydrodynamic behavior of electrons in graphene proposed (2019, April 25)
retrieved on April 25, 2019
from https://phys.org/news/2019-04-method-hydrodynamic- behavior- electrons-graphene.html

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