Scientists create atomic scale, trellis kagome electronics 2-D


(From left to right) Dr. Jincheng Zhuang, Dr. Yi Du and Dr. Zhi Li, Institute of Superconducting and Electronic Materials, University of Wollongong. Credit: Paul Jones

Scientists from the University of Wollongong (UOW), working with colleagues at Beihang University in China, Nankai University and Institute of Physics at the Chinese Academy of Sciences, have successfully created a two-dimensional atomic-scale kagome network with potential applications in electronics and electronics . Quantum computing.

The research paper is published in the November issue of Advances in science.

A kagome trellis is named from a traditional Japanese texture pattern consisting of interlaced triangles and hexagons.

The research team created the kagome network by layering and twisting two silicone nanosheets. Silicone is a Dirac fermionic material, one atom thick and one atom thick, with a honeycomb hexagonal structure, which electrons can accelerate at speed close to the speed of light.

When the silicene is twisted in a kagome network, the electrons are "trapped", circling the hexagons of the lattice.

Dr. Yi Du, who heads the Tunneling Microscopy (STM) group at the Institute of Superconducting and Electronic Materials (ISEM) at UOW and Beihang-UOW Joint Research Center, is the corresponding author of the article.

He said that scientists have long been interested in making a kagome 2-D network because of the useful theoretical electronic properties that such a structure would have.

"Theorists have long predicted that if you put electrons in an electronic kagome network, destructive interferences would mean that electrons, instead of flowing, would turn into a vortex and get locked in the structure. your way into a maze and never leave, "said Dr. Du.

"The interesting point is that electrons will be free only when the lattice is broken, when you create an edge. When an edge forms, the electrons 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.This is of great importance for designing and developing low cost energy devices.

"Meanwhile, with a strong spin-orbital coupling effect, it is expected that new quantum phenomena, such as the quantum Hall effect of friction, will happen at room temperature, which will pave the way for quantum devices in the future."

Although the theoretical properties of an electronic kagome network have become of great interest to scientists, the creation of such material has proved extremely challenging.

"To make it work as expected, you have to make sure that the network is constant and that the network lengths are comparable to the wavelengths of the electron, which controls many materials," said Du.

"It has to be a kind of material in which the electron can only move on the surface. And you have to find something that is conductive, and it also has a very strong spin-orbital coupling effect.

"There are not many elements in the world who have these properties."

One element that makes is silicene. Dr. Du and his colleagues created their 2-D electronic kagome network by twisting two layers of silicate together. At a rotation angle of 21.8 degrees they formed a kagome network.

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

"We observe all quantum phenomena theoretically envisioned in our artificial network of kagome in silicate," Du said.

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

Explore more:
Kagome metal & # 39 ;: physicists discover new quantum electronic material

More information:
Zhi Li et al. Realization of flat band with possible non-trivial topology in electronic network Kagome, Advances in science (2018) DOI: 10.1126 / sciadv.aau4511

Journal Reference:
Advances in science

Provided by:
University of Wollongong


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