NMR determination of Van Hove singularity and Lifshitz transitions in the nodal-line semimetal ZrSiTe
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We have applied nuclear magnetic resonance spectroscopy to study the distinctive network of nodal lines in the Dirac semimetal ZrSiTe. The low-T behavior is dominated by a symmetry-protected nodal line, with NMR providing a sensitive probe of the diamagnetic response of the associated carriers. A sharp low-T minimum in the NMR shift and (T1T)-1 provides a quantitative measure of the dispersionless, quasi-two-dimensional behavior of this nodal line. We also identify a Van Hove singularity closely connected to this nodal line, and an associated T-induced Lifshitz transition. A disconnect in the NMR shift and linewidth at this temperature indicates the change in electronic behavior associated with this topological change. These features have an orientation-dependent behavior indicating a field-dependent scaling of the associated band energies.
author list (cited authors)
Tian, Y., Zhu, Y., Li, R., Mao, Z., & Ross, J. H.
complete list of authors
Tian, Yefan||Zhu, Yanglin||Li, Rui||Mao, Zhiqiang||Ross, Joseph H