Crepaldi, A.Autes, G.Sterzi, A.Manzoni, G.Zacchigna, M.Cilento, F.Vobornik, I.Fujii, J.Bugnon, Ph.Magrez, A.Berger, H.Parmigiani, F.Yazyev, O. V.Grioni, M.2017-05-302017-05-302017-05-30201710.1103/PhysRevB.95.041408https://infoscience.epfl.ch/handle/20.500.14299/137828WOS:000400067600001The prediction of Weyl fermions in the low-temperature noncentrosymmetric 1T' phase of MoTe2 still awaits clear experimental confirmation. Here, we report angle-resolved photoemission (ARPES) data and ab initio calculations that reveal a surface state arc dispersing between the valence and the conduction band, as expected for a Weyl semimetal. However, we find that the arc survives in the high-temperature centrosymmetric 1T '' phase. Therefore, a surface Fermi arc is not an unambiguous fingerprint of a topologically nontrivial phase. We have also investigated the surface state spin texture of the 1T' phase by spin-resolved ARPES, and identified additional topologically trivial spin-split states within the projected band gap at higher binding energies.text::journal::journal article::research article