Nuclear spin-lattice relaxation time in TaP and the Knight shift of Weyl semimetals

Zoltán Okvátovity, Hiroshi Yasuoka, Michael Baenitz, Ferenc Simon, Balázs Dóra

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Abstract

We first analyze the recent experimental data on the nuclear spin-lattice relaxation rate of the Weyl semimetal TaP. We argue that its nonmonotonic temperature dependence is explained by the temperature-dependent chemical potential of Weyl fermions. We also develop the theory of the Knight shift in Weyl semimetals, which contains two counteracting terms. The diamagnetic term follows -ln[W/max(|μ|,kBT)] with W,μ, and T being the high-energy cutoff, chemical potential, and temperature, respectively, and is always negative. The paramagnetic term scales with μ and changes sign depending on the doping level. Altogether, the Knight shift is predicted to vanish or even change sign upon changing the doping or the temperature, making it a sensitive tool to identify Weyl points. We also calculate the Korringa relation for Weyl semimetals which shows an unusual energy dependence rather than being constant as expected for a noninteracting Fermi system.

Original languageEnglish
Article number115107
JournalPhysical Review B
Volume99
Issue number11
DOIs
Publication statusPublished - Mar 5 2019

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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