Thursday , May 19 2022

Scientists generate atomic scale, 2-D electronic kagome mesh


(From left) Dr. Jincheng Zhuang, Yi Du, and Dr. Wollongong University Superconductivity and Electronic Materials Institute. Zhi Li. Credits: Paul Jones

Scientists from Wollongong University (UOW), working with colleagues at Beihang University, Nankai University, China, and the Chinese Institute of Physics at the Chinese Academy of Sciences, formed an atomic scale, electronic two-dimensional electronic paperboards with potential applications in electronic form. quantum computation.

The research paper was published in the November issue. Scientific Developments.

It is the name of the traditional Japanesewovenbamboo pattern composed of a kagome cage, interlaced triangles and hexagons.

The research team formed the kagome cage by layering and bending two nanosis silicate. The silica is a silicon-based, atomic thickness, Dirac fermion material with a hexagonal honeycomb structure and can proceed at speeds close to the light velocity of the electrons.

But when a silicate kagome is bent into the cage, electrons are "trapped" by moving in the hexagons of the cage.

The researcher supervised the Tunnel Monitoring Microscope (STM) group at the Institute of Super Products and Electronics (ISEM) and the Beihang-UOW Joint Research Center. Yi Du is the author of the article.

Scientists have long been interested in making a 2-D kagome cage due to useful theoretical electronic features a structure can have.

"If the theoreticians put it in an electronic kagome weave a long time ago, it would mean that the destructive interventions would mean electrons, instead of swirling in a vortex and locked inside the cage. Du said.

. The interesting point is that the electrons will be free only when the lattice breaks, when you create an edge. When an edge is formed, the electrons will move with it without any electrical resistance – it has very low resistance, so very low energy and electrons can move very quickly at the speed of light. It is very important to design and develop low-energy cost devices.

"Meanwhile, the spin-orbital merging effect is strongly expected to occur at room temperature in the new quantum phenomenon, such as the quantum Hall effect of friction. This will lead to a future for quantum devices."

Although the theoretical properties of an electronic paperwork are of great interest to scientists, it is extremely difficult to create such material.

Al To work as predicted, you must make sure that the cage is stationary and that the length of the cage is comparable to the wavelength of the electron, Du Du said.

"There must be a type of material that the electron can only move on the surface. You should find something that is conductive and has a very strong spin-orbital bonding effect.

"There are not many elements in the world with these features."

An element that makes this is silica. Du and colleagues created the 2-ply electronic kagome cage by combining two siliceous layers. They formed a paper cage at a rotation angle of 21.8 degrees.

And when the researchers put electrons in, they behaved as expected.

Dr. . We have observed all the quantum phenomena that have been predicted theoretically in our artificial kagome cage, imiz Du said.

The expected benefits of this breakthrough will be much more energy efficient electronic devices and faster, more powerful computers.

Explore more:
& # 39; Kagome metal & # 39 ;: Physicists discover new quantum electronic materials

More information:
Zhi Li et al. Realization of flat band with possible nontrivial topology in Electronic Kagome Cafe Scientific Developments (2018). DOI: 10.1126 / sciadv.aau4511

Magazine reference:
Scientific Developments

Presented by:
Wollongong University

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