物理学进展

物理学进展 ›› 2021, Vol. 41 ›› Issue (3): 113-135.doi: 10.13725/j.cnki.pip.2021.03.001

所属专题： 2022年, 第42卷

• •    下一篇

拓扑绝缘体/超导体异质结中的近邻效应

  

  1. 1. 物质科学与技术学院，上海科技大学，上海，200031，中国; 2. 拓扑物理实验室，上海科技大学，上海，200031，中国; 3. 物理学院，中山大学，广州，510275，中国

  • 出版日期:2021-06-20 发布日期:2021-06-18

Proximity effect in topological insulator/superconductor heterostructure

  1. 1. School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China; 2. ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 200031, China; 3. School of Physics, Sun Yat-sen University, Guangzhou 510275, China

  • Online:2021-06-20 Published:2021-06-18
  • Supported by:

    National Natural Science Foundation of China (Nos. 61771234, 12004251), National Key Projects for Research and Development of China (No. 2017YFB0503302), the Natural Science Foundation of Shanghai (No. 20ZR1436100), the Science and Technology Commission of Shanghai Municipality, the startup funding from ShanghaiTech University, and Beijing National Laboratory for Condensed Matter Physics.

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摘要：

拓扑超导体自身具有对量子退相干天然的免疫性以及可编织性，这使得它在现代量子计算领域中受到了越来越多的重视，并且成为了下一代计算技术中最有希望的候选者之一。由于拓扑超导态在固有拓扑超导体中相当罕见，因此，当前大部分实验上的工作主要集中在由 s 波超导体与拓扑绝缘体之间通过近邻效应所诱导的拓扑超导体上。本论文中，我们回顾了基于拓扑绝缘体/超导体异质结的拓扑超导体的研究进展。在理论上，Fu 和 Kane 提出，通过近邻效应将 s 波超导体的能隙引入到拓扑绝缘体，可以诱导出拓扑超导电性。在实验上，我们也回顾了一些不同体系中的拓扑超导近邻效应的研究进展。文章的第一部分，我们介绍了一些异质结，包括：三维拓扑绝缘体 Bi2Se3和 Bi2Se3 与 s 波超导体NbSe2 以及 d 波超导体 Bi2Sr2CaCu2O8+δ 的异质结，拓扑绝缘体 Sn1−xPbxTe 与 Pb 的异质结，二维拓扑绝缘体 WTe2 与NbSe2 的异质结。此外，还介绍了 TiBiSe2 在 Pb 上的拓扑绝缘近邻效应。另一部分中，我们对基于拓扑绝缘体的约瑟夫森结进行了回顾，包括著名的基于 Fu-Kane 体系的拓扑绝缘体约瑟夫森结，以及基于约瑟夫森结的超导量子干涉器件。

关键词: 近邻效应, 拓扑超导体, 异质结, 约瑟夫森结

Abstract:

Topological superconductors have attracted increasing attentions for the purpose of the quantum computation, because the character of supporting topological qubits are immune to quantum decoherence and can be manipulated by braiding operation. Since the topological superconducting state is rather rare in the intrinsic topological superconductors, most of experimental efforts focus on inducing topological superconductors by the proximity effect in superconductor (SC)/topological insulator (TI) heterostructures. Fu and Kane have theoretically proposed that the topological superconductivity can be obtained by inducing an s-wave superconducting gap into TIs. After that, a lot of experimental progress has been made in different systems. In the first part of this review, we introduce the heterostructure of threedimensional (3D) TI Bi2Se3 and Bi2Te3 on s-wave SC NbSe2 and d-wave SC Bi2Sr2CaCu2O8+δ, topological crystalline insulator Sn1−xPbxTe on Pb, two-dimensional (2D) TI WTe2 on NbSe2, and TiBiSe2 on Pb. In the second part, the TI-based Josephson junctions are reviewed by introducing various experiments, including the Josephson junctions with TI barrier layers based on the Fu-Kane mode, and the superconducting quantum interference devices by TI based Josephson junctions.

Key words: proximity effect, topological superconductor, heterostructure, Josephson junction

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