Non-saturating quantum magnetization in Weyl semimetal TaAs

Cheng-Long Zhang, C. M. Wang, Zhujun Yuan, Xitong Xu, Guangqiang Wang, Chi-Cheng Lee, Li Pi, Changying Xi, Hsin Lin, Neil Harrison, Hai-Zhou Lu (), Jinglei Zhang () and Shuang Jia ()
Additional contact information
Cheng-Long Zhang: Peking University
C. M. Wang: Southern University of Science and Technology
Zhujun Yuan: Peking University
Xitong Xu: Peking University
Guangqiang Wang: Peking University
Chi-Cheng Lee: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
Li Pi: Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences
Changying Xi: Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences
Hsin Lin: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
Neil Harrison: National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS E536
Hai-Zhou Lu: Southern University of Science and Technology
Jinglei Zhang: Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences
Shuang Jia: Peking University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Detecting the spectroscopic signatures of relativistic quasiparticles in emergent topological materials is crucial for searching their potential applications. Magnetometry is a powerful tool for fathoming electrons in solids, by which a clear method for discerning relativistic quasiparticles has not yet been established. Adopting the probes of magnetic torque and parallel magnetization for the archetype Weyl semimetal TaAs in strong magnetic field, we observed a quasi-linear field dependent effective transverse magnetization and a non-saturating parallel magnetization when the system enters the quantum limit. Distinct from the saturating magnetic responses for non-relativistic quasiparticles, the non-saturating signals of TaAs in strong field is consistent with our newly developed magnetization calculation for a Weyl fermion system in an arbitrary angle. Our results establish a high-field thermodynamic method for detecting the magnetic response of relativistic quasiparticles in topological materials.

Date: 2019
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DOI: 10.1038/s41467-019-09012-4

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