Topological nodal line in ZrTe${}_2$ demonstrated by nuclear magnetic resonance

Abstract

In this work, we report nuclear magnetic resonance (NMR) combined with density functional theory (DFT) studies of the transition metal dichalcogenide ZrTe${}_2$. The measured NMR shift anisotropy reveals a quasi-2D behavior connected to a topological nodal line close to the Fermi level. With the magnetic field perpendicular to the ZrTe${}_2$ layers, the measured shift can be well-fitted by a combination of enhanced diamagnetism and spin shift due to high mobility Dirac electrons. The spin-lattice relaxation rates with external field both parallel and perpendicular to the layers at low temperatures match the expected behavior associated with extended orbital hyperfine interaction due to quasi-2D Dirac carriers. In addition, calculated band structures also show clear evidence for the existence of nodal line in ZrTe${}_2$ between $\Gamma$ and A. For intermediate temperatures, there is a sharp reduction in spin-lattice relaxation rate which can be explained as due to a reduced lifetime for these carriers, which matches the reported large change in mobility in the same temperature range. Above 200 K, the local orbital contribution starts to dominate in an orbital relaxation mechanism revealing the mixture of atomic functions.

arXiv comment9 pages, 5 figures

References in corpus (19)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Observation of the chiral magnetic effect in ZrTe5
• Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
• Three-dimensional quantum Hall effect and metal-insulator transition in ZrTe5
• Transition-Metal Pentatelluride ZrTe${}_5$ and HfTe${}_5$: a Paradigm for Large-gap Quantum Spin Hall Insulators
• Triple Point Topological Metals
• Tuning Electronic and Magnetic Properties of Early Transition Metal Dichalcogenides via Tensile Strain
• Nearly massless Dirac fermions and strong Zeeman splitting in the nodal-line semimetal ZrSiS probed by de Haas--van Alphen quantum oscillations
• Evidence for a Strong Topological Insulator Phase in $\mathrm{ZrT}{\mathrm{e}}_5$
• Transition between strong and weak topological insulator in ZrTe${}_5$ and HfTe${}_5$
• Metal-chalcogen bond-length induced electronic phase transition from semiconductor to topological semimetal in ZrX${}_2$ (X = Se and Te)
• Observation of Zeeman effect in topological surface state with distinct material dependence
• Vibrational and dielectric properties of the bulk transition metal dichalcogenides
• Dirac electron behavior and NMR evidence for topological band inversion in ZrTe5
• Unusual hyperfine interaction of Dirac electrons and NMR spectroscopy in graphene
• Nuclear spin-lattice relaxation time in TaP and the Knight shift of Weyl semimetals
• Interlayer quantum transport in Dirac semimetal BaGa${}_2$
• Divergence of the orbital nuclear magnetic relaxation rate in metals
• Crossing points of nodal lines in topological semimetals and Fermi surface of ZrSiS

Cited by in corpus (5)

• Pressure-induced Superconductivity and Topological Quantum Phase Transitions in the Topological Semimetal ZrTe2
• Gap-opening transition in Dirac semimetal ZrTe${}_5$
• NMR determination of Van Hove singularity and Lifshitz transitions in nodal-line semimetal ZrSiTe
• Hydrogen-impurity induced unconventional magnetism in semiconducting molybdenum ditelluride
• Experimental nuclear quadrupole resonance and computational study of the structurally refined topological semimetal TaSb${}_2$