IT House january 14 news, from the University of Electronic Science and Technology of China learned that on January 12, the internationally renowned journal "Nature" published a research paper entitled "Signatures of a strange metal in a bosonic system", the first time in a high-temperature superconductor found and confirmed the boson exotic metal.
IT House learned that the work was mainly completed by the team of academician Li Yanrong of the State Key Laboratory of Electronic Thin Films and Integrated Devices of the University of Electronic Science and Technology of China, with doctoral student Yang Chao as the first author and Professor Xiong Jie as the first corresponding author. This is another major discovery in the field of quantum technology after the team first reported the experimental discovery of quantum metal states in Science in 2019.
▲ Singular metal states near quantum metal-insulator quantum phase transition points in YBCO nano-mesh films (a) transport characteristic curves, (b) linear magnetoresistance curves, (c) Hall resistance Rxy changes with temperature, and (d) boson singular metal phase diagrams
Elementary particles in the universe are divided into two types: fermions and bosons. Among them, the development of the electronics industry and devices on which human society currently depends is almost entirely based on the fermion system, but due to high energy consumption, large losses, and physical size, it is facing the bottleneck problem of continuous improvement of performance, and cannot meet the rapid growth of information transmission needs. The boson devices represented by high-temperature superconductors have perfect zero-loss energy transfer characteristics, which is expected to bring about revolutionary changes in the electronic information industry. Singular metals, as the name suggests, differ from ordinary metals, whose resistivity is proportional to temperature and exist in copper-based high-temperature superconductors, are a new state of matter with a high degree of quantum entanglement between electrons, and their degree of confusion tends to the limits of quantum mechanics. Scientists discovered fermion exotic metals as early as thirty years ago, but the existence of boson exotic metals is a long-standing scientific problem.
Academician Li Yanrong and Professor Xiong Jie of the University of Electronic Science and Technology of China, together with Professor James M. Valles Jr of Brown University, Academician Xie Xincheng and Professor Wang Jian of Peking University, Liu Haiwen, researcher of Beijing Normal University, Sichuan University and other collaborators collaborated to solve the problem, successfully broke through the limitations of the fermion system, and induced a strange metallic state in the boson system for the first time. By accurately constructing a nano-mesh array in a high-temperature superconducting yttrium barium copper-oxygen (YBCO) film, the research team realized the cross-scale regulation of boson coherence, dissipative energy and other physical properties, and found a strange metal state in the critical region of quantum phase transition whose resistance changes linearly with temperature and magnetic field. At the same time, below the superconducting critical temperature, the system Hall resistance decreases sharply to zero, and there is an h/2e superconducting quantum magnetoresistance oscillation associated with the Cooper electron pair, proving that the carrier of the system is boson. Further through scale analysis, it is found that the resistance of boson exotic metals is determined by the simple linear addition of temperature and magnetic field, which proves that the resistance in the quantum critical region has nothing to do with the internal energy scale of the system, and the relationship between the scale is unchanged, revealing the strange dynamic behavior of bosons in the quantum critical region, and establishing a complete phase diagram of boson exotic metals, and illustrating the physical image of the dissipative quantum phase transition of the Bosonic system.
Internationally renowned theoretical physicist and academician of the American Academy of Sciences, Chandra M. Varma, published a special review article, highly praising the discovery of boson exotic metals as a major breakthrough in the field of condensed matter physics. Nature reviewers described this work as a transformative transformative outcome leading the development of quantum theory. At the same time, Nature has distributed a special review article to evaluate this work to break through the existing cognitive framework of exotic metallic states and disordered superconductors, and will promote a big step forward in the field of condensed matter physics. This discovery has laid an important scientific foundation for understanding the physical laws of exotic metals in condensed matter physics, revealing the universality of exotic metals, and improving the theory of quantum phase transition, which has important theoretical and practical significance for revealing the quantitative effect of dissipation effect on boson quantum coherence, and promoting the development of low-energy superconducting quantum computing and extremely highly sensitive quantum detection technology in the future.