Name: 魔法 "角度石墨烯回來了......有了更大的變化。 ('Magic' Angle Graphene Is BACK...with an Even Bigger Twist)
Uploaded: 2021-01-14T10:44:24.000Z
Duration: 4 min 28 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

I have got some mega news for you, my friends, and it involves two of our favorite words:

程度副詞

To understand this latest news, we have to go back to last year.

The physics world was sent into a tizzy by the discovery of a 'magic angle' in graphene.

Now, graphene is a single-atom thick layer of carbon that forms a hexagonal lattice pattern,

and its atomic arrangement gives it certain exciting properties, like being over 200 times

stronger than steel, flexible, transparent, and highly conductive.

This last property 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, they exhibit

alternating areas of conductivity and insulation.

So in some areas, they saw graphene bilayers with a twist to behave like a superconductor.

That means there's no resistance to an electrical current and therefore, the current can flow

But here's the kicker: we don't know why!

We don't fully understand what's happening at the molecular level to make this particular

orientation of graphene capable of superconduction And this year, in further exploring the capabilities

of this seemingly 'magical' twist, scientists have now discovered something that is arguably

An international team at the Institute of Photonic Science in Barcelona 'cleaned up'

They made what they call 'magic-angle twisted bilayer graphene devices', a name that will

Essentially, they took these two stacks of graphene rotated at the magic angle, and used

a mechanical squeezing process to eliminate impurities.

This squeaky clean version of the experiment allowed them to see details they hadn't

before like the device's incredible versatility.

It turns out, graphene stacked and turned at the magic angle can be tuned to act as

Depending on the charge running through it, the experimental setup could act as an insulator,

ust by changing the current running through the device, scientists could turn

states on and off, which is exciting for many reasons.

It could make these materials really useful inside electronics, as they're controllable

in much the same way our current electronics are: they're tunable.

But this new research is also a step toward solving the mystery of exactly how this happens.

Work like this lets us explore and manipulate the microscopic world inside graphene devices,

allowing us to better understand how this material works and how we can use it.

In addition to furthering our existing understanding of how these bilayer graphene stacks behave,

the team was able to beat the record temperature at which the material behaves as a superconductor.

And this is incredibly important, as our existing ways of inducing superconducting behavior

in most materials requires extremely low temperatures and/or high pressures.

Superconductors would be so useful if they didn't require such low temperatures to

And in the field of physics, discovering or creating a room-temperature superconductor is considered

This most recent graphene work has demonstrated that graphene magic angle bilayer devices

can act as superconductors at a temperature above 3 Kelvin—which, while not the warmest,

is the highest temperature ever demonstrated for a graphene superconductor.

Along with graphene's other tantalizing properties, achieving superconductivity at

easier-to-maintain temperatures could be seriously useful in many future applications.

Things like incredibly efficient power transfer, hovertrains, or even quantum computing.

But that future can only really become a reality if we develop a better understanding of the mechanisms

of action at play, and can use that understanding to improve the performance of 'magic' materials like this.

What are your thoughts on graphene and its many 'magical' properties?

Let us know down in the comments below, and for more on superconductor breakthroughs,

Subscribe to Seeker to stay up to date with all new materials science discoveries, and

thanks so much for watching. I'll see you next time.