Magnetoresistance and quantum oscillations of an electrostatically tuned semimetal-to-metal transition in ultrathin WTe[subscript 2]
Name
PhysRevB.95.041410.pdf
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1012.38 KB
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Checksum (MD5)
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Author(s)
Gibson, Quinn D.
Watanabe, Kenji
Taniguchi, Takashi
Cava, Robert J.
Fatemi, Valla
Jarillo-Herrero, Pablo
Alternative Title
Magnetoresistance and quantum oscillations of an electrostatically tuned semimetal-to-metal transition in ultrathin WTe 2
Date Issued
January 2017
Journal
Physical Review B
Publisher
American Physical Society
Citation
Fatemi, Valla et al. “Magnetoresistance and Quantum Oscillations of an Electrostatically Tuned Semimetal-to-Metal Transition in Ultrathin WTe[subscript 2].” Physical Review B 95.4 (2017): n. pag. © 2017 American Physical Society
Version
Final published version
Abstract
We report on electronic transport measurements of electrostatically gated nanodevices of the semimetal WTe[subscript 2]. 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.95.041410
