拓扑晶体绝缘体Pb $_{0.6}$ Sn $_{0.4}$ Te纳米结的超导电性
Unexpected superconductivity at nanoscale junctions made on the topological crystalline insulator Pb$_{0.6}$Sn$_{0.4}$Te
摘要：
从拓扑非平凡系统中发现物质的奇异相不仅使拓扑材料的研究更加有趣，而且丰富了我们对这类材料迷人物理的理解。Pb $_{0.6}$ Sn $_{0.4}$ Te最近被证明是拓扑晶体绝缘体。在这里，我们表明，通过形成一个介观的点接触，使用一个正常的非超导元素金属的表面上的Pb $_{0.6}$ Sn $_{0.4}$ Te的一个新的超导相被创建局部在一个有限的区域下的点接触。这发生在样品的主体保持非超导并且超导相在点接触下作为纳米液滴出现时。超导相显示出高的转变温度$T_c$，其对于不同的点接触而变化，并且落在3.7 K和6.5 K之间的范围内。因此，这封信提出了一个新的超导相的拓扑晶体绝缘体的表面上的发现，这一发现有望揭示在一般的拓扑非平凡系统中诱导超导性的机制。
英文摘要：
Discovery of exotic phases of matter from the topologically non-trivial systems not only makes the research on topological materials more interesting but also enriches our understanding of the fascinating physics of such materials. Pb$_{0.6}$Sn$_{0.4}$Te was recently shown to be a topological crystalline insulator. Here we show that by forming a mesoscopic point-contact using a normal non-superconducting elemental metal on the surface of Pb$_{0.6}$Sn$_{0.4}$Te a novel superconducting phase is created locally in a confined region under the point-contact. This happens while the bulk of the sample remains to be non-superconducting and the superconducting phase emerges as a nano-droplet under the point-contact. The superconducting phase shows a high transition temperature $T_c$ that varies for different point-contacts and falls in a range between 3.7 K and 6.5 K. Therefore, this Letter presents the discovery of a new superconducting phase on the surface of a topological crystalline insulator and the discovery is expected to shed light on the mechanism of induced superconductivity in topologically non-trivial systems in general.
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