  The past decade has witnessed the burgeoning discovery of a variety of
topological states of matter with distinct nontrivial band topologies. Thus
far, most of materials studied possess two-dimensional or three-dimensional
electronic structures, with only a few exceptions that host
quasi-one-dimensional (quasi-1D) topological electronic properties. Here we
present the clear-cut evidence for Dirac fermions in the quasi-1D telluride
TaNiTe5. We show that its transport behaviors are highly anisotropic and we
observe nontrivial Berry phases via the quantum oscillation measurements. The
nontrivial band topology is further corroborated by first-principles
calculations. Our results may help to guide the future quest for topological
states in this new family of quasi-1D ternary chalcogenides.
