University of Science and Technology of China, Hefei National Laboratory for Microscale Physical Science Professor Wang Zhengfei, Professor Liu Feng of the University of Utah, Academician Xue Qikun of Tsinghua University, Researcher Ma Xucun of the Tsinghua University, and Zhou Xingjiang researcher of the Institute of Physics of the Chinese Academy of Sciences, discovered for the first time the iron-based HTS materials. A new type of one-dimensional topology boundary state, which was published online on July 4th in Nature - Materials.
Superconducting materials and topological materials are two hot topics in condensed matter physics in recent years. Theoretical physicists have predicted that a superconducting superconducting material will produce Mayorana Fermions under the vortex center of a magnetic field. Since the anti-particle of Maiorana Fermions is itself, it is not easily destroyed by traditional electromagnetic or physical interference and can be used to define qubits in quantum computing, which helps to solve the problem of decoherence of traditional qubits and improve its Life time. The advantage of quantum computing over classical computing lies in the superposition principle of quantum mechanics, which enables the parallel processing of classical calculations.
In the nature, no topological superconducting materials have been found so far. How to design and find topological superconducting materials has become a focus of attention of researchers. In order to realize single-material high-temperature topological superconductors, researchers took FeSe/SrTiO3, a novel high-temperature superconducting material, as the research object, combined with theoretical calculations, scanning tunneling microscopes, and angle-resolved photoelectron spectroscopy, systematically studied their antiferromagnetic electronic configurations. In addition, the existence of a new type of one-dimensional topological boundary state in the topological energy gap opened by spin-orbit coupling is observed in real space.
This work reveals the simultaneous existence of both superconductivity and topological properties in FeSe/SrTiO3, so the doping of electrons and holes can further adjust the position of superconductivity and topological energy gaps. This is to explore the single-material high-temperature topological superconductors and Mayorana Fermat has opened up new research approaches. At the same time, this work also helps to further understand the mechanism of high-temperature superconductivity of FeSe/SrTiO3, which is of great significance for promoting the mechanism research of iron-based high-temperature superconducting materials. (Reporter Wu Changfeng)
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