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Gate-tunable negative longitudinal magnetoresistance in the predicted type-II Weyl semimetal WTe2

Author

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  • Yaojia Wang

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Erfu Liu

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Huimei Liu

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Yiming Pan

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Longqiang Zhang

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Junwen Zeng

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Yajun Fu

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Miao Wang

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Kang Xu

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Zhong Huang

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Zhenlin Wang

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Hai-Zhou Lu

    (South University of Science and Technology of China)

  • Dingyu Xing

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Baigeng Wang

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Xiangang Wan

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Feng Miao

    (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

Abstract

The progress in exploiting new electronic materials has been a major driving force in solid-state physics. As a new state of matter, a Weyl semimetal (WSM), in particular a type-II WSM, hosts Weyl fermions as emergent quasiparticles and may harbour novel electrical transport properties. Nevertheless, such a type-II WSM material has not been experimentally observed. In this work, by performing systematic magneto-transport studies on thin films of a predicted material candidate WTe2, we observe notable negative longitudinal magnetoresistance, which can be attributed to the chiral anomaly in WSM. This phenomenon also exhibits strong planar orientation dependence with the absence along the tungsten chains, consistent with the distinctive feature of a type-II WSM. By applying a gate voltage, we demonstrate that the Fermi energy can be in-situ tuned through the Weyl points via the electric field effect. Our results may open opportunities for implementing new electronic applications, such as field-effect chiral devices.

Suggested Citation

  • Yaojia Wang & Erfu Liu & Huimei Liu & Yiming Pan & Longqiang Zhang & Junwen Zeng & Yajun Fu & Miao Wang & Kang Xu & Zhong Huang & Zhenlin Wang & Hai-Zhou Lu & Dingyu Xing & Baigeng Wang & Xiangang Wan, 2016. "Gate-tunable negative longitudinal magnetoresistance in the predicted type-II Weyl semimetal WTe2," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13142
    DOI: 10.1038/ncomms13142
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    Cited by:

    1. Federico Balduini & Alan Molinari & Lorenzo Rocchino & Vicky Hasse & Claudia Felser & Marilyne Sousa & Cezar Zota & Heinz Schmid & Adolfo G. Grushin & Bernd Gotsmann, 2024. "Intrinsic negative magnetoresistance from the chiral anomaly of multifold fermions," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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