Unusual high-frequency quantum oscillations in topological nodal semimetal ZrSiS

The layered-structured ZrSiS has been confirmed to be a topological nodal semimetal, a family of three-dimensional topological material in which the linear band touching forms a one-dimensional Dirac line-node. We carried out magneto-transport and torque magnetometry measurement in ZrSiS single crystals. In addition to the multiple small Fermi pockets, we observed two bunches of high-frequency quantum oscillations, with the frequencies in the range of 7.2-9.1 kT and 10.2-11.2 kT, respectively. The corresponding electron orbit area is as large as 20-30% of the two-dimensional Brillouin zone in xy-plane. Most intriguingly, these high-frequency oscillations are very sensitive with the tilt angle of applied magnetic field. Their amplitudes can be significantly suppressed by a small tile angle φ ~ 1°. Also, the temperature dependence of oscillation amplitudes shows abnormal non-monotonic behavior. We suggest that the exotic high-frequency oscillations are related to the Dirac nodal loop in the xy-plane.