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探针下的量子奇境:拓扑超导体的原子级精准构筑与探测*

Quantum wonderland beneath a microscopic tip:constructing and probing topological superconductors with atomic precision

  • 摘要: 拓扑超导体作为近年来新兴的一类超导体,是研究物质拓扑性、超导对称性等基础物性的理想平台。拓扑超导体还可以支持一种反粒子等于其自身的马约拉纳任意子的存在,这种神奇粒子有望被应用于容错量子计算。扫描隧道显微镜及扫描隧道显微谱仪由于其极高的空间分辨率和能量分辨率,是在原子尺度研究物质拓扑超导电性的先进实验手段。文章简要介绍了拓扑超导体及马约拉纳任意子的相关物理性质及理论模型,并回顾了近年来利用扫描隧道显微技术对拓扑超导体及马约拉纳任意子的有关研究进展。整体上该领域的微观尺度研究发展迅速,一系列新型拓扑超导物质体系被相继发现,并找到了马约拉纳任意子存在的一些有力证据。同时,仍需要多维度的探测及表征手段来加深对拓扑超导体中所观测到的各种新奇物态的理解。

     

    Abstract: Topological superconductors, an emergent class of superconducting states, provide an ideal platform for the investigation of topology as well as parity symmetry. They also support the existence of Majorana anyons—quasiparticles that are their own antiparticles—with potential applications in fault-tolerant quantum computation. Scanning tunneling microscopy and spectroscopy are advanced experimental techniques widely used to study topological superconducting states due to their ultrahigh spatial and energy resolution. In this article, we briefly discuss the fundamental properties and theoretical models of topological superconductors and Majorana anyons, as well as recent experimental progress based on scanning tunneling microscopy. Overall, research on topological superconductors at the nanoscale is advancing rapidly, with numerous potential material platforms being realized and growing evidence for Majorana anyons being reported. However, multi-dimensional detection methods and more systematic experimental investigations are still needed to achieve a comprehensive understanding of the novel phenomena observed.

     

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