Following the "topological insulator" and "quantum anomalous Hall effect", the scientific research team led by Fang Zhong, a researcher at the Institute of Physics, Chinese Academy of Sciences, has made a major breakthrough. For the first time, a "chiral" electronic state, the Weyl fee, has been discovered. Yonago. This is an important scientific breakthrough in physics research in the world. It is of great significance to breakthrough technologies such as "topology electronics" and "quantum computer". The discovery of the entire process from theoretical prediction to experimental observation was independently completed by our scientists.
In 1929, the German scientist H. Weyl pointed out that no "quality" (ie, linear dispersion) electrons can be divided into two different "chiralities": left-handed and right-handed. This is Weyl fermion. However, over 80 years have passed, people have not been able to observe Weyl fermions in experiments. In recent years, the rapid development of topological insulators, especially topological semimetals, has provided new ideas and approaches for the generation and observation of Weyl fermions.
No realization of "quality" electronics
In 2012 and 2013, the Institute’s theoretical research team for the first time predicted that “mass†electrons could be realized in Dirac semimetals, although due to certain symmetry protections, the two “chiral†opposite electronic states overlap It is impossible to separate them together, but it has taken a crucial step towards achieving truly separated "chiral" electrons.
Breaking the protection of symmetry
In 2014, the team for the first time predicted that central symmetry protection could be broken in TaAs, TaP, NbAs, and NbP materials systems to achieve the separation of two “chiral†electrons. This series of materials can be naturally synthesized without the need for detailed and complicated regulation such as doping, which is more conducive to experimental discovery. This result immediately attracted the attention of experimental physicists, and many research groups began the competition-like experimental verification work.
Discover Weyl Fermi
Weyl Fermi hides in TaAs crystals. The Chen Gen-fu group of the Institute of Physics first prepared bulk TaAs crystals with an atomic-level flat surface, and then the Ding Hong team used the synchrotron beam of the Shanghai Light Source “Dreamline†to irradiate the TaAs crystals, making Weyl Fermi more than 80 years old. Once in front of scientists.
"chiral" electrons are promising
The semi-metal with “chiral†Weyl fermions can realize low-energy electronic transmission, which is expected to solve the energy consumption problems faced by current miniaturization and multi-functionalization of electronic devices. At the same time, Weyl fermions have topological stability and can be used to achieve Highly fault-tolerant topological quantum computation.
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