Electrically tunable low-density superconductivity in a monolayer topological insulator
Electrically tunable low-density superconductivity in a monolayer topological insulator
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DOI：
10.1126/science.aar4642
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发表时间：
2018-11-23
期刊：
影响因子：
56.9
通讯作者：
Jarillo-Herrero, Pablo
中科院分区：
文献类型：
--
作者：
Fatemi, Valla;Wu, Sanfeng;Jarillo-Herrero, Pablo
在拓扑非平凡绝缘体中开启超导性可能提供一条寻找非阿贝尔拓扑态的途径。然而，现有的超导体-绝缘体开关的演示只涉及拓扑平凡的系统。在这里，我们报告可逆的，在原位静电开关的超导性在最近建立的量子自旋霍尔绝缘体单层碲化钨（WTe 2）。制造成一个货车范德华场效应晶体管，单层的基态可以连续地从拓扑绝缘的超导状态，与临界温度T-c高达类似于1开尔文的门调谐。我们的研究结果建立单层WTe 2作为工程纳米器件，结合联合收割机超导和拓扑相的物质的材料平台。
Turning on superconductivity in a topologically nontrivial insulator may provide a route to search for non-Abelian topological states. However, existing demonstrations of superconductor-insulator switches have involved only topologically trivial systems. Here we report reversible, in situ electrostatic on-off switching of superconductivity in the recently established quantum spin Hall insulator monolayer tungsten ditelluride (WTe2). Fabricated into a van der Waals field-effect transistor, the monolayer's ground state can be continuously gate-tuned from the topological insulating to the superconducting state, with critical temperatures T-c up to similar to 1 kelvin. Our results establish monolayer WTe2 as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.