Gap-opening transition in Dirac semimetal ZrTe${}_5$

Abstract

We apply ${}^{125}$Te nuclear magnetic resonance (NMR) spectroscopy to investigate the Dirac semimetal ZrTe${}_5$. With the NMR magnetic field parallel to the $b$-axis, we observe significant quantum magnetic effects. These include an abrupt drop at 150 K in spin-lattice relaxation rate. This corresponds to a gap-opening transition in the Dirac carriers, likely indicating the onset of excitonic pairing. Below 50 K, we see a more negative shift for the Te${}_z$ bridging site indicating the repopulation of Dirac levels with spin polarized carriers at these temperatures. This is the previously reported 3D quantum Hall regime; however, we see no sign of a charge density wave as has been proposed.

arXiv comment5 pages, 4 figures

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• NMR determination of Van Hove singularity and Lifshitz transitions in nodal-line semimetal ZrSiTe
• Engineering a pure Dirac regime in ZrTe${}_5$
• Site-dependent Local Spin Susceptibility and Low-energy Excitation in a Weyl Semimetal WTe${}_2$
• Theory of phonon instabilities in Weyl semimetals at high magnetic fields
• Optical manipulation of the topological phase in ZrTe5 revealed by time- and angle-resolved photoemission