Dai, J.Frantzeskakis, E.Aryal, N.Chen, K-WFortuna, F.Rault, J. E.Le Fevre, P.Balicas, L.Miyamoto, K.Okuda, T.Manousakis, E.Baumbach, R. E.Santander-Syro, A. F.2021-06-192021-06-192021-06-192021-05-1410.1103/PhysRevLett.126.196407https://infoscience.epfl.ch/handle/20.500.14299/179334WOS:000652838900003We report the observation of a nontrivial spin texture in Dirac node arcs, i.e., novel topological objects formed when Dirac cones of massless particles extend along an open one-dimensional line in momentum space. We find that such states are present in all the compounds of the tetradymite M2Te2X family (M = Ti, Zr, or Hf and X = P or As) regardless of the weak or strong character of the topological invariant. The Dirac node arcs in tetradymites are thus the simplest possible textbook example of a type-I Dirac system with a single spin-polarized node arc.Physics, MultidisciplinaryPhysicsinsulatorsemimetalsurfacediscoverystatesconetext::journal::journal article::research article