Experimental observation and spin texture of Dirac node arcs in tetradymite topological metals

Abstract

We report the observation of a non-trivial spin texture in Dirac node arcs, 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 M${}_2$Te${}_2$X 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.

Main Text + Supplementary Information, 12 pages, 11 figures

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Cited by in corpus (2)

• Observation of anisotropic Dirac cones in the topological material Ti2Te2P
• Anomalous Linear and Quadratic Nodeless Surface Dirac Cones in Three-Dimensional Dirac Semimetals