A team of researchers was able to generate and detect rotating currents in Grafen without using external magnetic fields for the first time, successfully cope with the long -standing challenge in physics. Development can play an important role in the evolution of the next generation quantum devices.
Special rotating currents are a key ingredient in Spintronics, a new type of technology that uses electrons rotation instead of electric charge to carry information. SpINTRONICS promises ultra -brush, super energy -efficient devices from today’s electronics, but what works in practical materials such as Grafen was difficult.
“In particular, the detection of quantum rotating currents in Grafen has always required large magnetic fields that are practically impossible to integrate the chip,” says Tali Ghiasi, a leading researcher and post-dollars at the Delft Technical University in the Netherlands.
However, in their latest study, Ghiasi and his team have already shown that by placing graphene on a carefully selected magnetic material, they can activate and control quantum rotating currents without magnets. This discovery could pave the way to ultra-based, AIDS-based chains and help to overcome the gap between electronics and future quantum technologies.
Achieve a double hall effect in Graffen
In order to understand what this study is doing specifically, it is appropriate to know that the team is trying to create the effect of quantum AIDS (QSH). This is a special condition in which electrons move only along the edges of material and their spins are in the same direction.
The movement is smooth and is not spread by small imperfections, a dream scenario for performing effective low power chains. However, so far, Grafen shows this effect requires the application of strong magnetic fields.
Instead of forcing Grafen to behave differently with magnets, researchers have taken a different approach. They placed a sheet of graphene on a layered magnetic material called chromium thiophosphate (CRPSâ‚„). This material naturally affects nearby electrons through what scientists call the magnetic effects of closeness.
An unexpected anomalous effect of the hall
When the graphene is arranged on CRPSâ‚„, its electrons begin to feel two key powers; AIDS-orbital connection (which connects the movement of the electron to its rotation) and the exchange of interaction (which favors certain directions of rotation). These forces open an energy gap in the structure of the graphene and lead to the emergence of state conditions, which is a sign of the QSH effect.
The researchers have confirmed that the rotating currents flow at the ends of the graphene and remain stable at distances of dozens of micrometers, even in the presence of small defects.
They also noticed something unexpected, anomalous hall (Ah), in which the electrons are diverted aside even without an external magnetic field. Unlike the QSH effect they observe at low (cryogenic) temperatures, this abnormal behavior continues even at room temperature.
“The detection of QSH states of zero external magnetic field, along with the AH signal, which is stored to room temperature, opens the route for practical applications of magnetic graphene in quantum alcohol schemes,” the study authors noted.
The huge potential of rotating currents
Stable, topologically protected AIDS currents can be used to transmit quantum information at longer distances, possibly connecting the cubes in future quantum computers. They also open the door to ultra-memory memory and logical chains that operate cooler and more efficiently than today’s silicon-based devices.
“These topologically protected AIDS currents are stable against disorders and defects, making them reliable even under imperfect conditions,” Ghiasi said.
However, there are some restrictions on overcoming. Unlike AH, the QSH effect, which is more suitable for the development of quantum circuits, observed here only at very low temperatures, which limits its immediate use in consumer electronics.
Researchers are now striving to explore ways to make the effects healthier at higher temperatures and explore other material combinations where this approach can work.
The study has been published in the magazine Natural communicationsS