Gap-Opening Transition in Dirac Semimetal ZrTe_{5}. Academic Article uri icon

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 150K in spin-lattice relaxation rate. This corresponds to a gap-opening transition in the Dirac carriers, likely indicating the onset of excitonic pairing. Below 50K, 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.

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • Tian, Y., Ghassemi, N., & Ross, J. H

publication date

  • January 1, 2021 11:11 AM