Wednesday , January 26 2022

Scientists have a three-dimensional & # 39; topological & # 39; They make a medium electromagnetic wave pattern


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Topological insulators are exotic static matter that the physicists are studying in the past decade. The strangest feature is to rigorously distinguish it from any other material using a mathematical concept called "topology". This mathematical property gives them topological insulators without the dissipation of transport signals, by means of special quantum states called "topological surfaces".

However, topological insulators should not only be realized by electrons. The physicist has also designed photonic topological insulators with synthetic materials that transmit light waves with topological properties with topological features, rather than electric currents (rather than current surfaces) through topological surfaces. Unlike topologic electronic isolators, topological photolayer insulators can work easily at room temperature, among other things. As a result, photonic topological insulators could be applications in optical devices, such as high-power lasers and optical diodes.

A group of researchers at the Nanyang Technology University (NTU), Singapore and Zhejiang University (China) have developed a photonic topological three-dimensional (3-D) photol. The next issue to be published in a paper to be published Nature, the team confirms that a specially designed 3-D resonator range acts as a topological insulation microwave. The topological surfaces of the underlying surface have been clearly seen, with microwave oven emitted easily by 2-D ink embedded within the 3 D volume of the sample.

"Previous researchers were able to make topological two-dimensional insulators of dimension, but despite many theoretical proposals over many years, no one could make a 3-D version," says Professor NTU's Baile Zhang, head of the project. 3-D topological insulators have important capabilities, including the ability to focus surface topological surfaces. In one of the experiments, the researchers were able to efficiently guide the microwaves in a 2-cycle surface, in a zig-zag folds.

The group built 3-D photonic topological isolation with a thin plastic embedded metal antennas, acting as a small electromagnetic resonator. When a remarkable progress was made, it was best to know how the resonator was bound in a specific way with electromagnetic waves, giving waves the desired topology properties.

"The use of expanded technologies has been designed to create cheap and easy to print tables for circuits," says Professor Hongsheng Chen of Zhejiang University, another co-supervisor of the project. "Comparing, other proposals published in previous releases have been published on ceramic magnetic materials or non-standard materials, and it is very difficult for you to make a real device."

Dr Yihao Yang, Ph.D., PhD researcher, was the main author of paper, scientists could build a science topic to find out how electromagnetic waves travel in the photonic topological insulator. "By testing the electromagnetic field by sampling, we have measured the sample distribution areas, which has allowed us to reconstruct" dispersal relations "as a physical signature of topological insulators," he said.

Associate professor Yidong Chong, another member of the NTU group, is the first accomplishment of a 3-D synthetic topological insulator based on the electric current current. "This is an example of the universality of physics," he said. "A phenomenon that emerges in a environment, like quantum materials, can be reproduced in another environment, in this case an artificial support for electromagnetic waves. Key components comprise the same equations and theoretical concepts." 3-D Photon topological isolation can provide an interesting framework for basic physics studies, as topological surfaces are the same equations, unlike the 2-D electrons of Einstein's relativity theory.

The current 3-D photonic topological isolation is an electromagnetic wave limit, at a fairly low frequency. "It is possible to access optical frequencies, such as waves of visible light, to be able to create optical chips, lasers and interesting optical devices," says professor Zhang.

Explore more:
A new topological insulator

Magazine reference:

School of Physical and Mathematical Sciences, Nanyang University of Technology

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