Scientists see spinning in a two-dimensional magnet

Scientists see spinning in a two-dimensional magnet

The coupling between magnons and excitons will allow researchers to see spin directions, an important consideration for many quantum applications. Credit: Zhong Jui Yu

All magnets—from simple souvenirs hanging on your fridge to disks that give computer memory to powerful versions used in research labs—contain spinning quasiparticles called Magnons. The direction of rotation of the singer can affect the direction of his neighbor, affecting the rotation of his neighbor, etc., resulting in what are known as spin waves. It is possible that information travels through spin waves more efficiently than electricity, and the magnetons can act as “quantum bonds” that “glue” quantum bits together in powerful computers.

Magnons have tremendous potential, but are often difficult to detect without the huge pieces of lab equipment. Such settings are good for experiments, but not for developing devices, such as magnetic devices and so-called Columbia University researcher Xiaoyang Zhu, said Columbia University researcher Spentronics. Vision the magnons However, it can be made much simpler with the right material: a magnetic semiconductor called chromium sulfide bromide (CrSBr) that can be peeled into two-dimensional atom-thin layers, made in the lab of chemistry professor Xavier Roy.

In a new article in temper natureand Zhu and collaborators at Columbia, the University of Washington, New York University, and Oak Ridge National Laboratory show that magnons in CrSBr can mate with other semi particle It’s called an exciton, and it emits light, providing researchers with a way to “see” the rotating quasiparticle.

When they perturbed the magnetons with light, they observed oscillations of excitons in the near-infrared range, which can be seen almost with the naked eye. “For the first time, we can see magnons with a slight visual effect,” Zhou said.

First author Yun Jun (Eunice) Bai, a postdoctoral researcher in Chu’s lab, said the results might be viewed as a quantum conversion, or the conversion of one “quantum” of energy into another. The energy of excitons is four times greater than that of magnons; Now that they are paired so strongly together, we can easily notice small changes in the magnons, Bai explained. This transduction may one day enable researchers to build quantum information networks that can take information from a spin Quantum bit—which generally need to be placed within millimeters of each other — and converted into light, a form of energy that can transmit information up to hundreds of miles across optical fibers

Consolidation time – how long oscillations It can last—it was also great, Zhou said, lasting much longer than the experiment’s five nanosecond limit. This phenomenon can travel to more than seven micrometers and persist even when the CrSBr devices are made of only two thin atomic layers, increasing the possibility of constructing spintronic nanodevices. These devices could one day be more efficient alternatives to today’s electronics. Unlike electrons in the . band electric current which encounter resistance as it travels, the particles do not actually move in spin wave.

From here, the researchers plan to explore the quantitative information potential of CrSBr, as well as other candidate materials. “At MRSEC and EFRC, we’re exploring the quantum properties of many 2D materials that you can stack like papers to create all kinds of new physical phenomena,” Chu said.

For example, if magnon-exciton Coupling can be found in other types of magnetic semiconductors with slightly different properties than CrSBr, and they may emit light in a wider range of colors.

“We are assembling the toolbox to create new devices with customizable features,” Chu added.

Unique quantum materials could enable ultra-powerful compact computers

more information:
Youn Jue Bae et al., Exciton-coupled coherent magnetons in a 2D semiconductor, temper nature (2022). DOI: 10.1038 / s41586-022-05024-1

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