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首页> 外文期刊>Physical review >Twofold symmetry of proximity-induced superconductivity in Bi_2Te_3/Bi_2Sr_2CaCu_2O_(8+δ) heterostructures revealed by scanning tunneling microscopy
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Twofold symmetry of proximity-induced superconductivity in Bi_2Te_3/Bi_2Sr_2CaCu_2O_(8+δ) heterostructures revealed by scanning tunneling microscopy

机译：通过扫描隧道显微镜显示的Bi_2Te_3 / Bi_2SR_2CACU_2O_（8 +δ）异质结构的双重诱导的超导诱导的超导性对称性

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摘要

We observe proximity-induced superconductivity in in situ prepared heterostructures constructed by topo-logical insulator Bi_2Te_3 thin films and high-temperature cuprate superconductors Bi_2Sr_2CaCu_2O_(8+δ). The superconducting gap maximum is about 7.6 meV on the surface of Bi_2Te_3 thin films with a thickness of two quintuple layers, and the gap value decreases with an increase in the film thickness. Moreover, the quasiparticle interference data show clear evidence of a twofold symmetric superconducting gap with gap minima along one pair of the principal crystalline axes of Bi_2Te_3. This gap form is consistent with the Δ_(4y) notation of the topological superconductivity proposed in such systems. Our results provide fruitful information on the possible topological superconductivity induced by the proximity effect in high-temperature superconducting cuprates.
机译：我们观察到通过顶部逻辑绝缘体Bi_2Te_3薄膜和高温铜替代超导体Bi_2SR_2CACU_2O_（8 +δ）构成的原位制备的异质结构中的接近诱导的超传导性。超导间隙最大值为约7.6mEV在具有两个Quintuple层的厚度的Bi_2Te_3薄膜表面上，间隙值随膜厚度的增加而降低。此外，QuAsiparticle干扰数据显示了具有沿着Bi_2Te_3的一对主要晶体轴的间隙最小值的双重对称超导间隙的清晰证据。该间隙形式与此类系统中提出的晶体超导性的Δ_（4Y）符号一致。我们的结果提供了有关通过高温超导铜酸酯在高温超导效应中诱导的可能拓扑超导性的富有成效信息。

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  • 来源
    《Physical review》 |2020年第22期|220503.1-220503.6|共6页
  • 作者

    Siyuan Wan; Qiangqiang Gu; Huazhou Li; Huan Yang; J. Schneeloch; R. D. Zhong; G. D. Gu; Hai-Hu Wen;

  • 作者单位

    National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China;

    National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China;

    National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China;

    National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China;

    Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA;

    Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA;

    Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA;

    National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China;

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