Looking for a spread of things

When the army is falling flat: Looking for the spread of things

It’s an artistic demonstration of scattering the band for a given object. The black ribbons show the different groups, although the constant charge is kinetic energy. At the center are two flat pieces from the same kagome pattern. Available: © MPI CPfS

Finding the right things to do things with exotic quantum properties is a subject for experimental scientists, because it is impossible for a combination of different things to be synthesized.

From now on, they can continue to work without being blindfolded thanks to a global team led by Andrei Bernevig, Ikerbasque visiting professor at the Donostia International Physics Center (DIPC) and doctor at Princeton University, and Nicolas Regnault, from Princeton University. and the Ecole Normale Supérieure Paris, CNRS, with the participation of Luis Elcoro from the University of the Basque Country (UPV / EHU).

The company conducted a systematic search for candidates in a massive rubbish of 55,000 items. The finishing process begins with the discovery of so -called flat surfaces, that is, electric states with constant kinetic energy. Therefore, in a flat belt the nature of the electrons is largely controlled by the interaction with other electrons. However, the researchers found that not only the flat surface was necessary, because when the electrons were fixed to the atoms, even in a flat surface, they could not move and form. to the interesting states of matter. “You want the electrons to know each other, something you can accomplish by making sure they’re multiplied in space.

Topology plays an important role in new condensed matter physics as suggested by the three Nobel Prizes in 1985, 1997 and 2016. It encourages certain quantum wave processes to be amplified so that they do not appear to be internal perturbation such as impurities. It could impose certain physical assets, such as resistance, enumeration or lead to the proper administration of the states.

Fortunately, the company is there to first show the topological properties of the bands through their method called “topological quantum chemistry,” and then give them a large database of materials, and with design tools to locate topological flat areas.

By using tools ranging from analytical techniques to brute-force detection, the team has obtained everything it currently sees in nature. This list of browsers is available online with its own search engine. “The community was able to search for topological flat plots of objects. We found, out of 55,000 objects, about 700 indicating what could be interesting flat plots,” he said. said Yuanfeng Xu, from Princeton University and the Max Planck Institute of Microstructure Physics, one of the two lead authors of the study. “We’ve confirmed that the materials we’re promoting are promising candidates for chemical synthesis,” said Leslie Schoop from the Princeton chemistry department. The team further analyzed the topological properties of these groups, revealing the nature of the delocalized electrons they host.

Now that this large list is complete, the company is beginning to grow what is predicted to see experimentation in a number of new connected states. “Now that we know where to look, we need to grow these things,” said Claudia Felser from the Max Planck Institute for Chemical Physics of Solids. “We have a dream team of experimenters working with us. They want to measure the physical properties of these candidates and see what exciting quantum events come out.”

List of flat groups, published at so so on 30 March 2022, showing the end of years of research by the company. “There are a lot of people, and there are a lot of charities and universities where we have shown the program that it is said to be very difficult and impossible to do. It took us a few years, but we worked. , “said Andrei Bernevig.

The publication of this list will not only reduce the serendipity in the search for new materials, but will also allow for the extensive search for compounds with exotic properties, such as magnetism and superconductivity. , with applications to memory or the duration of dissipationless transport of power.


Good news for future technology: Exotic ‘topological’ objects are common


More information:
Nicolas Regnault et al, Catalog of flat-band stoichiometric material, so so (2022). DOI: 10.1038 / s41586-022-04519-1

Presented by Max Planck Society

Directions: The band is falling apart: Looking for the spread of wealth (2022, March 30) Retrieved March 30, 2022 from https://phys.org/news/2022-03-band-falls- flat-flatness-materials.html

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