'Magic' Angle Graphene Is BACK...with an Even Bigger Twist
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5 سال پیش
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Scientists have unveiled a whole
Scientists have unveiled a whole new world of physics that could lead to the superconductors we've been waiting for.
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In 2018, the discovery of something called a “magic angle” in graphene rocked the physics community.
Graphene is a single-atom thick layer of carbon that forms a hexagonal lattice pattern, and its atomic arrangement gives graphene certain exciting properties, like being more than 200 times stronger than steel, flexible, transparent, and highly conductive.
And that last property, the highly conductive one, was highlighted in 2018 when researchers put two layers of graphene on top of each other and twisted them at exactly 1.1 degrees. They cooled the graphene structure to just above absolute zero, applied a strong electric field, and found that not only are these graphene bilayers highly conductive...but that they exhibit alternating areas of conductivity and insulation.
This means that scientists saw graphene bilayers (with a twist) behaving like a superconductor. And the thing is, we don’t really know why.
And now this year, while exploring the capabilities of this seemingly ‘magical’ twist further, scientists uncovered something that is arguably an even bigger deal.
An international team at the Institute of Photonic Science in Barcelona made what they call ‘magic-angle twisted bilayer graphene devices,’ by taking two stacks of graphene rotated at the magic angle, and using a mechanical squeezing process to eliminate impurities. This version of the experiment allowed researchers to see details they hadn’t before, like the device’s incredible versatility.
Find out more about how this magic angle graphene can act as an insulator, superconductor, or magnet on this Elements.
#Graphene #Superconductors #Physics #Science #Seeker #Elements
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Read More:
A Physics Magic Trick: Take 2 Sheets of Carbon and Twist
www.nytimes.com/2019/10/30/science/graphene-physic…
"'He’s the guy who’s done this the best,' Andrea Young, a physics professor at the University of California, Santa Barbara who was not involved in the research, said of Dr. Efetov and his collaborators. 'Somehow they have the magic touch.'"
Superconductivity: What Is It and Why It Matters to Our Future
interestingengineering.com/superconductivity-what-…
"To get material into a superconductive state, the material has to be frozen to an extremely low temperature, sometimes to only a few degrees above absolute zero (-459.67 degrees Fahrenheit, -273.15 degrees Celsius). Then, for reasons that we still cannot explain, electrical resistance abruptly stops, and an electrical current can continue around a circuit seemingly forever."
Physicists Have Officially Smashed The Record For High-Temperature Superconductivity
www.sciencealert.com/physicists-have-officially-sm…
"So-called room-temperature superconductivity, above 0 degrees Celsius, is something of a white whale for scientists. If it could be achieved, it would revolutionise electrical efficiency, vastly improving power grids, high-speed data transfer, and electrical motors, to name a few potential applications."
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5 سال پیش
در تاریخ 1398/10/05 منتشر شده
است.
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