Researchers at MIT have discovered an unexpected material that exhibits a strange physical phenomenon called Kohn anomaly. Researchers at the Massachusetts Institute of Technology and elsewhere believe that these processes help determine why metals and other materials exhibit complex electronic properties that have become the basis of today's technology. The team says that the way electrons and phonons interact determines the physical processes that take place inside many electronic devices.
These interactions have been difficult to study in detail because they are usually very weak. However, new research has discovered a new, longer-lasting, unusual electron-phonon interaction called the Kohn anomaly. This anomaly was thought to exist only in conductive materials such as graphene, but was discovered in a strange material called topological Weyl semimetal. In this case, the Weyl half metal is tantalum phosphide. Scientists say this discovery can help clarify important aspects of the complex interaction between electrons and phonons.
MIT graduate students Thanh Nguyen and Nina Andrejevic, postdoctoral Ricardo Pablo-Pedro, research scientist Han Fei, Professor Li Mingda, and 14 people from MIT and several other universities and national laboratories described this in their paper this weekend This new discovery is based on theoretical predictions and experimental observations. To measure the interaction, the team used advanced neutron and X-ray scattering probes in three national laboratories to probe the behavior of tantalum phosphide materials.
The researchers said that they predicted the existence of Kohn anomalies in the material based on theory. They can lead the experiment to where they want to find the phenomenon, and they can see that there is a good agreement between theory and experiment. Researchers say that a better understanding of electron-phonon coupling can provide clues for the development of better materials such as high-temperature semiconductors or fault-tolerant quantum computers. The team said that because these materials are so new, they need time to think about what they can do.
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