Researchers discover way of layering graphene to mimic brain synapses
“Holy shit”—me anytime a new discovery pertaining to graphene is announced.
What can this batshit substance do this time, is a very fair question to ask yourself as soon as you read the words graphene. If you’re not familiar, graphene is essentially sheets of atom thin carbon in a lattice formation that gives it what can only be described as magical properties. Scientists have been doing research on it for a while now, and it’s being used to create insanely fast and powerful batteries, sun sucking solar panels (opens in new tab), and even tempting us with the promise of 100TB HDDs in the next decade (opens in new tab).
This is because graphene is a material with incredible conductive potential and abilities. It’s been a bit of a revolution in the tech space, but we’re still largely waiting to see it hit mainstream devices. As more testing is done, scientists seem to keep discovering amazing potential with graphene, and this new discovery, thanks to researchers at MIT (opens in new tab), may just change our perception of this substance once more. It might even be the key to making brain-like computers, like Intel’s efforts for the Loihi 2 (opens in new tab).
As it turns out, graphene isn’t just an excellent conductor, but it can also be convinced to become ferromagnetic. This means graphene can be coerced into a magnetic state that it can retain even without a magnetic field. This is cool in itself, but is enhanced by the discovery that this can also be turned on and off.
When it comes to atom thin materials like graphene, or say, crystals grown on silicon, the way they’re aligned and stacked can have a huge effect on the end result. So much so that one particular way of layering graphene is now known as the magic-angle. This kind of atom-small angling work is also known as twisted electronics or twistronics. For this discovery, researchers were working to align two stacks of hexagonal graphene layers between two slices of boron nitride to increase the strength of the graphenes magnetic force.
While playing with the alignment, researchers discovered a new way of layering the substances to a very unique effect. Rather than simply creating a stronger magnetic field, they found they can turn graphene’s superconductivity on and off with electrical pulses. This occurred when the top layer of boron nitride and two graphene slices aligned, while the bottom layer of boron nitride was at an angle. The overall look is described as a lopsided sandwich. I kinda want to feed one to my Miraidon in Pokémon Violet.
“For the vast majority of materials, if you remove the electric field, zzzzip, the electric state is gone,” says Jarillo-Herrero, who is the Cecil and Ida Green Professor of Physics at MIT. “This is the first time that a superconducting material has been made that can be electrically switched on and off, abruptly. This could pave the way for a new generation of twisted, graphene-based superconducting electronics.”
Possibly the best part about this is that the researchers don’t fully understand where this ability to be switched on and off is coming from. They are fairly sure it’s to do with this twisted alignment and the boron nitride. Still, the ability to turn graphene into a persisting superconductor is huge, let alone having it switch states on a whim.
“People are trying to build electronic devices that do calculations in a way that’s inspired by the brain,” Jarillo-Herrero says. “In the brain, we have neurons that, beyond a certain threshold, they fire. Similarly, we now have found a way for magic-angle graphene to switch superconductivity abruptly, beyond a certain threshold. This is a key property in realizing neuromorphic computing.”
Of course, MIT isn’t the only place with their eyes looking to the future of brain-computing. Dr Mark Dean, better known for breaking the 1GHz clock speed, is working on neuromorphic computing (opens in new tab). These are silicon based, and are designed to mimic synapses firing, which it sounds like these graphene switches could be great for. With companies like Samsung looking to get a human brain pasted onto an SSD (opens in new tab), it looks like graphene might end up being the answer to all of those questions.
