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Proximity effect at the superconductor-topological insulator interface

机译：超导体-拓扑绝缘子界面处的邻近效应

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摘要

We study the excitation spectrum of a topological insulator in contact with an s-wave superconductor, starting from a microscopic model, and develop an effective low-energy model for the proximity effect. In the vicinity of the Dirac cone vertex, the effective model describing the states localized at the interface is well approximated by a model of Dirac electrons experiencing superconducting s-wave pairing. Away from the cone vertex, the induced pairing potential develops a p-wave component with a magnitude sensitive to the structure of the interface. Observing the induced s-wave superconductivity may require tuning the chemical potential close to the Dirac point. Furthermore, we find that the proximity of the superconductor leads to a significant renormalization of the original parameters of the effective model describing the surface states of a topological insulator.
机译：从微观模型出发，我们研究了与s波超导体接触的拓扑绝缘子的激发光谱，并开发了一种有效的低能模型用于邻近效应。在狄拉克锥顶附近，描述狄拉克电子经历超导s波对的模型很好地近似了描述界面处状态的有效模型。远离圆锥顶点，感应的配对电位会产生p波分量，其幅度对界面的结构敏感。观察感应的s波超导性可能需要将化学势调整到接近Dirac点。此外，我们发现超导体的接近性导致描述拓扑绝缘体表面状态的有效模型的原始参数发生了显着的重新规范化。

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  • 来源
    《Physical review》 |2010年第24期|P.241310.1-241310.4|共4页
  • 作者

    Tudor D. Stanescu; Jay D. Sau; Roman M. Lutchyn; S. Das Sarma;

  • 作者单位

    Department of Physics, West Virginia University, Morgantown, West Virginia 26506, USA Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland,College Park, Maryland 20742-4111, USA;

    rnCondensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland,College Park, Maryland 20742-4111, USA;

    rnCondensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland,College Park, Maryland 20742-4111, USA;

    rnCondensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland,College Park, Maryland 20742-4111, USA;

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  • 正文语种 eng
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  • 关键词

    quantum computation; fermions in reduced dimensions (anyons, composite fermions, luttinger liquid, etc.); proximity effects; Andreev effect; SN and SNS junctions;

    机译：量子计算缩小尺寸的费米子（任意子;复合费米子;吸液剂液体等）;邻近效应;安德列夫效应;SN和SNS交界处;

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