Sunday , July 21 2019
Home / zimbabwe / Exotic topological materials are surprisingly common

Exotic topological materials are surprisingly common



Feb. 27, 2019

(Nanowerk News) The Nobel Prize in Physics received a major breakthrough in the field of research, an international group is a very common substance that is known as exotic electronic behaviors known as topological material, and is, among others, everyday elements of arsenic and gold. The Group created an online catalog (www.topologicalquantumchemistry.com) to design new topological materials using elements of the periodic table.

These materials have unexpected and extravagant properties that have changed the way scientists understand how they behave like electrons. Researchers hope that these substances will be the basis for future technologies, such as low power devices and quantum computing.

"After analyzing and correcting errors, the results have been surprising: more than a quarter of all materials show a variety of topologies," said B. Andrei Bernevig, author of the paper ("High-level catalog-topological material of government") and Princeton physics professor . "Topology is everywhere in material, not esoteric."

Topological material is intriguing, surfaces can withstand electricity without resistance, so that today's technologies are becoming more and more efficient. The noun covers the underlying theories based on topology, which describes the ability to cover or cover objects of a mathematical branch.

The beginnings of the theoretical understanding of these issues of the subject were the Nobel Prize in Physics, Professor F. Duncan Haldane, Princeton University, Sherman Fairchild University Physics, J. Michael Kosterlitz, Brown University and David J. Thouless, University of Washington-Seattle.

So far, more than 200,000 non-organic crystalline materials have only a hundred tissues that have been topologically characterized and are thought to be anomalies.

"When you're done, this catalog will bring a new era of topological material," said Bernevig. "This is the beginning of a new kind of periodic table, where compounds and elements are more traditional than their traditional topological properties."

The international team was attended by researchers from Princeton; Donostia International Physics Center in San Sebasti√°n; IKERBASQUE Basque Foundation for Science; University of the Basque Country; Cole Normale Suprieure Paris and the French National Center for Scientific Research (CNRS); and the Max Planck Institute for Physical Physical Solids.

The group investigated about 25,000 non-organic materials, which were experimentally accurately analyzed by Atomic Structures and classified in the Non-Organic Crystal Data Base. The results show that it is more than rare, with more than 27% of material material being topological.

The newly created database allows visitors to select periodic table items to create compound compounds for the topological properties of the user. Currently, more materials are being analyzed and a database is being published for the future.

The two factors have been a complex task of classifying 25,000 compounds topologically.

First of all, two years ago, today's writers have created a theory in quantum chemistry topology and published it Nature In 2017, it allowed the classification of the topological properties of any material, from the knowledge of the positions and nature of the atoms.

Secondly, in today's study, theoretically, this theory has been applied to compounds in the Non-Organic Crystals Structure database. To this end, the authors had to write, modify and modify computerized instructions for calculating the energy of electron materials.

We have had to incorporate these old programs and calculate the necessary electronic properties for the calculation of the same, said Dr. Zhijun Wang, Ph.D., Ph.D., Ph.D., Associate Professor, and is currently a Professor at the Beijing Institute of Physical Computing and the Chinese Academy of Physics, Sciences.

Then, we analyze these results and calculate their topological properties based on topologically new quantum chemicals, "said Luis Elcoro, professor at the University of the Basque Country, in Bilbao.

The authors wrote several sets to obtain and analyze topology of real material electrons. The authors have made these codes a public code through the Crystallographic Server of Bilbao (http://www.cryst.ehu.es/cgi-bin/cryst/programs/topological.pl). With the support of the Max Planck Supercomputer Center in Garching, Germany, researchers have 25,000 compounds.

"In computation, it was very intensive," said Nicolas Regnault, professor at Normale Suprieure, in Paris, and the CNRS Research Director at the National Center for Scientific Research in France. "Fortunately, the theory showed that we should only calculate part of the data we needed for the first time. The electron should only see part of the spatial parameter for obtaining a topology of a system."

"Material understanding has been much richer as a result of this classification," said Maia Garcia Vergniory, a researcher at the Donostia International Physics Center. "It's really the last line of understanding of material properties".

Claudia Felser, lecturer at the Max Planck Institute of Solid Physics at Dresden, previously announced that gold is topological. "Many of the material properties we know of gold-colored gold can be understood from topological reason," said Felser.

The group now works to topologically classify the compound compounds in the database. The next step involves identifying compounds with variables, conductivity and other better properties, and experimentally testing its topological nature. "Then we dream about the topical topology of the table," said Bernevig.


Source link