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

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arxiv 2105.07515 v1 pith:Y4TEDB6X submitted 2021-05-16 cond-mat.mes-hall cond-mat.mtrl-scicond-mat.str-el

J. Dai , E. Frantzeskakis , N. Aryal , K.-W. Chen , F. Fortuna , J. E. Rault , P. Le Fèvre , L. Balicas
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K. Miyamoto T. Okuda E. Manousakis R. E. Baumbach A. F.Santander-Syro
This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.mtrl-scicond-mat.str-el
keywords diracnodearcstopologicalobservationspintetradymitetexture
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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.

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