= S, Se, Te)

The breakthrough in the discovery of topological semimetals provides opportunities to explore the exotic properties of relativistic fermions in condensed matter. Among those materials, the Dirac nodal-line semimetal represents one type of topological quantum state which displays Dirac cones along a one-dimensional line, in contrast with the topological nodal point Dirac or Weyl semimetals. Here we report the quantum oscillation studies on the nodal-line semimetals ZrHM (H=Si, Ge, Sn; M=S, Se, Te). We have revealed the signatures of nodal-line states in these materials and studied their evolution with dimensionality and spin-orbit coupling, which varies with the selections of H and M. These properties, plus the availability of atomic thin two-dimensional flakes and varied strength of spin splitting, make ZrHM a tunable platform for investigating topological fermion physics and for further exploration of electronic and spintronic science and applications.