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arXiv · 1802.08801

Non-saturating Quantum Magnetization in Weyl semimetal TaAs

Cheng-Long Zhang·C. M. Wang·Zhujun Yuan·Chi-Cheng Lee·Li Pi·Changying Xi·Hsin Lin·Neil Harrison·Hai-Zhou Lu·Jinglei Zhang·Shuang Jia
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Abstract

Detecting the spectroscopic signatures of Dirac-like quasiparticles in emergent topological materials is crucial for searching their potential applications. Magnetometry is a powerful tool for fathoming electrons in solids, yet its ability for discerning Dirac-like quasiparticles has not been recognized. 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 strongly enhanced parallel magnetization when the system is in the quantum limit. Distinct from the saturating magnetic responses for massive carriers, 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 for the first time establish a thermodynamic criterion for detecting the unique magnetic response of 3D massless Weyl fermions in the quantum limit.

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Cheng-Long Zhang, C. M. Wang, Zhujun Yuan, Chi-Cheng Lee, Li Pi, Changying Xi, Hsin Lin, Neil Harrison, Hai-Zhou Lu, Jinglei Zhang, Shuang Jia. 2018-02-24. Non-saturating Quantum Magnetization in Weyl semimetal TaAs. https://doi.org/10.1038/s41467-019-09012-4

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