Magnetoresistance and Quantum Oscillations of an Electrostatically Tuned Semimetal-to-Metal Transition in Ultra-Thin WTe2

Abstract

We report on electronic transport measurements of electrostatically gated nano-devices of the semimetal WTe\textsubscript{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 sub-quadratic and density-independent, suggesting new physics specifically in the semimetallic regime.

6 pages, 3 figures

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• Control over Berry Curvature Dipole with Electric Field in WTe2
• Direct evidence for charge compensation induced large magnetoresistance in thin WTe2
• Origin of the Extremely Large Magnetoresistance in the Semimetal YSb
• Thermopower and Unconventional Nernst in the Predicted Type-II Weyl Semi-metal WTe${}_2$
• Experimental Progress on Layered Topological Semimetals
• Observation of Dirac surface states in the hexagonal PtBi2, a possible origin of the linear magnetoresistance
• Observation of Shubnikov-de Haas Oscillations in Large-Scale Weyl Semimetal WTe2 Films
• Nearly isotropic superconductivity in layered Weyl semimetal WTe${}_2$ at 98.5 kbar
• Crossover Between Weak Antilocalization and Weak Localization and Electron-Electron Interaction in Few-Layer WTe${}_2$
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• Room-temperature van der Waals magnetoresistive memories with data writing by orbital current in the Weyl semimetal TaIrTe4
• Quantum oscillation study of the large magnetoresistance in Mo substituted WTe${}_2$ single crystals
• Facilitating field-free perpendicular magnetization switching with a Berry curvature dipole in a Weyl semimetal
• The out-of-plane magnetoresistance in a Van der Waals thin film of WTe2