@article{7e8775d701a34d00a4e091a49b57c98e,
title = "Magnetoresistance and quantum oscillations of an electrostatically tuned semimetal-to-metal transition in ultrathin WTe2",
abstract = "We report on electronic transport measurements of electrostatically gated nanodevices of the semimetal WTe2. High mobility metallic behavior is achieved in the 2D limit by encapsulating thin flakes in an inert atmosphere. At low temperatures, we find that a large magnetoresistance can be turned on and off by electrostatically doping the system between a semimetallic state and an electron-only metallic state, respectively. We confirm the nature of the two regimes by analyzing the magnetoresistance and Hall effect with a two-carrier model, as well as by analysis of Shubnikov-de Haas oscillations, both of which indicate depletion of hole carriers via the electrostatic gate. This confirms that semiclassical transport of two oppositely charged carriers accurately describes the exceptional magnetoresistance observed in this material. Finally, we also find that the magnetoresistance power law is subquadratic and density independent, suggesting new physics specifically in the semimetallic regime.",
author = "Valla Fatemi and Gibson, {Quinn D.} and Kenji Watanabe and Takashi Taniguchi and Cava, {Robert J.} and Pablo Jarillo-Herrero",
note = "Funding Information: This work was partly supported by the DOE, Basic Energy Sciences Office, Division of Materials Sciences and Engineering, under award DE-SC0006418 (sample fabrication and measurements) and partly through AFOSR Grant No. FA9550-16-1-0382 (data analysis), as well as the Gordon and Betty Moore Foundation'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. Crystal growth at Princeton University was supported by the NSF MRSEC program Grant No. DMR-1005438. This work made use of the Materials Research Science and Engineering Center 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. We thank E. Navarro-Moratalla, J. D. Sanchez-Yamagishi, and L. Bretheau for discussions and Sanfeng Wu for help with crystal exfoliation. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",
year = "2017",
month = jan,
day = "30",
doi = "10.1103/PhysRevB.95.041410",
language = "English (US)",
volume = "95",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "4",
}