Large magneto-elastoresistance in WTe2

ORAL

Abstract

Elastoresistance is the relative change of a material’s resistance under strain. Its value depends on two contributions: one coming from changes in the sample’s geometry and another from changes of the electronic properties such as carrier densities or scatering rates. In common metals like copper, the geometric contribution dominates a temperature-independent elastoresistance with a value of about 2. In other materials, including Bi, changes in the electronic properties dominate. We find that WTe2 is a member of the second group exhibiting an elastoresistance as large as -20. Moreover, we discover that the magnetic field has a dramatic effect on the elastoresistance in WTe2, resulting in values of elastoresistance in applied magnetic field between -80 to 120. We present a detailed analysis of this phenomenon combining results from DFT calculations and quantum oscillation measurements. We conclude that such large magneto-elastoresistance can be realized in other semi-metals with crystal structures similar to WTe2.

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Presenters

  • Na Hyun Jo

    Iowa State University, Iowa State University and Ames Laboratory, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA, Department of Physics & Astronomy, Iowa State University, Department of Physics and Astronomy, Iowa State University, Department of physics and astronomy, Iowa State University/Ames Laboratory, Physics, Iowa State University/Ames Laboratory

Authors

  • Na Hyun Jo

    Iowa State University, Iowa State University and Ames Laboratory, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA, Department of Physics & Astronomy, Iowa State University, Department of Physics and Astronomy, Iowa State University, Department of physics and astronomy, Iowa State University/Ames Laboratory, Physics, Iowa State University/Ames Laboratory

  • Lin-Lin Wang

    Ames Laboratory, Iowa State University

  • Peter P. Orth

    Ames Laboratory, Iowa State University, Department of Physics and Astronomy, Iowa State University, Iowa State University, Ames IA, Physics and Astronomy, Iowa State University, Department of physics and astronomy, Iowa State University/Ames Laboratory

  • Gil Drachuck

    Department of physics and astronomy, Iowa State University/Ames Laboratory

  • Sergey L. Bud'ko

    Iowa State University, Ames Laboratory and Iowa State University, Ames, IA, USA, Department of Physics & Astronomy, Iowa State University, Department of Physics and Astronomy, Iowa State University, Department of physics and astronomy, Iowa State University/Ames Laboratory

  • Paul Canfield

    Ames Laboratory and Dept. of Physics, Iowa State University, Ames Laboratory, U.S. DOE, Iowa State University, Ames, Iowa 50011, USA., Ames Laboratory, Iowa State University, Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA, Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University, Iowa State University and Ames Laboratory, Ames Laboratory and Iowa State University, Ames, IA, USA, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA, Ames Lab & Dept of Physics and Astronomy, Iowa State University, Department of Physics & Astronomy, Iowa State University, Department of physics and astronomy, Iowa State University/Ames Laboratory, Physics, Iowa State University/Ames Laboratory, Ames Laboratory & Iowa State University, Physics, Iowa State University