Three-dimensional topological semimetal phase in layered TaNi Te 5 probed by quantum oscillations

Recently layered compound $\\mathrm{TaNi}{\\mathrm{Te}}_{5}$ was proposed to be two-dimensional (2D) topological semimetals. Here we report the detailed investigation on $\\mathrm{TaNi}{\\mathrm{Te}}_{5}$ single crystals through magnetotransport and de Hass\\ensuremath{-}van Alphen (dHvA) effect studies. Strong quantum oscillations with multiple periodicities have been observed. By analyzing the quantum oscillations, we provide evidence of nontrivial Berry phase with a 3D Fermi surface character in layered $\\mathrm{TaNi}{\\mathrm{Te}}_{5}$. Our work suggested that layered $\\mathrm{TaNi}{\\mathrm{Te}}_{5}$ should be 3D topological semimetal which offers a platform to explore exotic properties in low-dimensional topological semimetals.