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Chinese scientists confirm for the first time the existence of quantum metal states in quantum phase transitions

                       
Update:26-11-2019
Summary:

The reporter learned from the University of Electronic […]

The reporter learned from the University of Electronic Science and Technology of China on November 15 that the school led a research team composed of relevant experts such as Peking University, Beijing Normal University, Tsinghua University, Brown University, and the United States to fully confirm for the first time in the world the quantum in high-temperature superconducting nanoporous films. The existence of metal states provides new ideas for studying quantum metal states. The related paper "Superconducting-Bose Metal State in Insulation Phase Transition" has been published in the form of "first release" in the internationally renowned journal "Science".

Quantum materials and quantum phase transitions are hotspots in the field of condensed matter physics and materials in this century. Since the discovery of high-temperature superconductivity, the existence and formation mechanism of two-dimensional quantum metal states has been an important physical problem that has been outstanding in the international academic community for more than 30 years. According to the Anderson scale theory, due to the quantum interference effect and the phase coherence length divergence at zero temperature, carriers will show localized effects when they approach absolute zero, so theoretically there is no two-dimensional quantum metal state. Although possible signs of quantum metal states have been found experimentally in various two-dimensional superconducting systems, the existence of two-dimensional quantum metal states is still controversial due to the low critical temperature and the influence of external high-frequency noise.

As the original achievement of the State Key Laboratory of Electronic Thin Films and Integrated Devices of this school, it was proposed in a research paper of the University of Electronic Science and Technology of China as the first unit and Yang Chao as the first author. By adjusting the reactive ion etching time, A superconducting-quantum metal-insulator phase transition was achieved in a yttrium-barium-copper-oxygen (YBCO) porous film; it was found that the three quantum states of superconductivity, metal, and insulation are related to Cooper electron pairs through very low temperature transport tests The h / 2e period superconducting quantum permeation oscillation proves that the quantum metal state is a Bose metal state, revealing that Cooper played a leading role in the formation of the quantum metal state by the boson. In the future, this exploration of the origin of quantum metals will change the understanding of quantum materials in the international academic community and promote the development of the field of quantum devices.

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