Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA, 91128 Palaiseau Cedex, France.
Science. 2018 Nov 23;362(6417):926-929. doi: 10.1126/science.aar4642. Epub 2018 Oct 25.
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 (WTe). 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 up to ~1 kelvin. Our results establish monolayer WTe as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.
在拓扑非平庸绝缘体中开启超导可能为寻找非阿贝尔拓扑态提供了一种途径。然而，现有的超导-绝缘转变开关的演示都只涉及拓扑平庸系统。在这里，我们报告了最近发现的量子自旋霍尔绝缘体单层二碲化钨（WTe）中超导的可逆、原位静电导通-关断。将其制成范德瓦尔斯场效应晶体管，该单层的基态可以从拓扑绝缘态连续地被栅极调谐到超导态，临界温度高达约 1 开尔文。我们的结果确立了单层 WTe 作为一种工程纳米器件的材料平台，该器件结合了超导和拓扑物质相。
