@article{a180abda485c49da8ad0f60d7937ea9d,
title = "Electrically tunable low-density superconductivity in a monolayer topological insulator",
abstract = "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 Tc up to ∼1 kelvin. Our results establish monolayer WTe2 as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.",
author = "Valla Fatemi and Sanfeng Wu and Yuan Cao and Landry Bretheau and Gibson, {Quinn D.} and Kenji Watanabe and Takashi Taniguchi and Cava, {Robert J.} and Pablo Jarillo-Herrero",
note = "Funding Information: We thank L. Fu for helpful discussions and J. I.-J. Wang for assistance in operating the dilution refrigerator. Funding: This work was partly supported through AFOSR grant no. FA9550-16-1-0382 as well as the Gordon and Betty Moore Foundation{\textquoteright}s EPiQS Initiative through grant no. GBMF4541 to P.J.-H. Device nanofabrication was partly supported by the Center for Excitonics, an Energy Frontier Research Center funded by the DOE, Basic Energy Sciences Office, under award no. DE-SC0001088. This work made use of the Materials Research Science and Engineering Center{\textquoteright}s Shared Experimental Facilities supported by NSF under award no. DMR-0819762. Sample fabrication was performed partly at the Harvard Center for Nanoscale Science supported by the NSF under grant no. ECS-0335765. S.W. acknowledges the support of the MIT Pappalardo Fellowship in Physics. The WTe2 crystal growth performed at Princeton University was supported by an NSF MRSEC grant, DMR-1420541. Growth of BN crystals was supported by the Elemental Strategy Initiative conducted by the MEXT, Japan, and JSPS KAKENHI grant nos. JP15K21722 and JP25106006. Author contributions: V.F. and S.W. fabricated the devices, performed electronic transport measurements, and analyzed the data. Y.C. and L.B. helped with measurements. Q.D.G. and R.J.C. grew the WTe2 crystals. K.W. and T.T. grew the BN crystals. P.J.-H. supervised the project. V.F., S.W., and P.J.-H. cowrote the manuscript with input from all co-authors. Competing interests: The authors declare no competing financial interests. Data and materials availability: Hexagonal boron nitride crystals were provided by K.W. and T.T. under a material transfer agreement with NIMS. All data needed to evaluate the conclusions in the paper are present in the paper or the supplementary materials and have been deposited at (40). Publisher Copyright: {\textcopyright} 2018 American Association for the Advancement of Science.All right reserved.",
year = "2018",
month = nov,
day = "23",
doi = "10.1126/science.aar4642",
language = "English (US)",
volume = "362",
pages = "926--929",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "6417",
}