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冉峰, 梁艳, 张坚地

Quasi-two-dimensional superconductivity at oxide heterostructures

Ran Feng, Liang Yan, Jiandi Zhang
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  • 由于对称性破缺、晶格失配、电荷转移和空间限域等多自由度的协同关联作用, 氧化物异质界面演生出许多与相应体材料所不同的物理性质, 其中氧化物界面超导由于蕴含丰富物理内涵吸引了广泛的关注. 近年来, 得益于氧化物异质外延以及物性精准表征技术的迅猛发展, 研究人员已经在多种氧化物异质界面上观测到了准二维的界面超导, 并研究了与其相关的许多新奇量子现象, 不仅推动了凝聚态物理研究的发展, 也为界面超导走向实际应用奠定了重要基础. 本文主要介绍和讨论氧化物界面上的准二维超导, 以典型的LaAlO 3/SrTiO 3界面准二维超导及La 2CuO 4/La 1.56Sr 0.44CuO 4等铜氧化物界面超导为例, 总结分析氧化物界面超导中新奇的物理现象, 并指出该研究体系目前存在的一些问题, 最后展望界面超导未来的发展方向.
    Oxide interfaces manifest many fascinating phenomena with synergetic correlations among multiple degrees of freedom, including the interplay of broken symmetry, lattice mismatch, charge transfer, spatial confinement. In particular, the interface superconductivity in oxide heterostructure has attracted extensive attention due to the rich underlying physical connotations. The interfaces not only provide alternative research platforms with respect to the bulk material counterpart for exploring new superconductors and investigating superconducting mechanisms, but also create new opportunities for applying superconductors to future electronic devices. In recent years, owing to the rapid development of heteroepitaxial techniques and accurate characterization methods, researchers have found quasi-two-dimensional interface superconductivity in various oxide heterostructures and revealed numerous novel quantum phenomena associated with interface superconductivity, which not only promotes the development of condensed matter physics, but also lays important foundation for the practical application of interface superconductivity. In this brief review, we mainly focus on the quasi-two-dimensional superconductivity at oxide interface. Taking the typical quasi-two-dimensional superconductivity at the LaAlO 3/SrTiO 3interface and copper oxides such as La 2CuO 4/La 1.56Sr 0.44CuO 4for example, we summarize and examine some novel physical phenomena with interface superconductivity in complex oxide heterostructures. Then we address the related problems that remain to be solved, and finally we prospect the possible future development of the interface superconductivity.
        通信作者:张坚地,Jiandi@iphy.ac.cn
      • 基金项目:国家重点研发计划(批准号: 2022YFA1403000)资助的课题.
        Corresponding author:Jiandi Zhang,Jiandi@iphy.ac.cn
      • Funds:Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1403000).
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    出版历程
    • 收稿日期:2023-01-09
    • 修回日期:2023-02-20
    • 上网日期:2023-03-07
    • 刊出日期:2023-05-05

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