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EnglishThe 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.
| Titolo: | Persistence of a surface state arc in the topologically trivial phase of MoTe2 |
| Autori: | |
| Data di pubblicazione: | 2017 |
| Stato di pubblicazione: | Pubblicato |
| Rivista: | |
| Abstract: | The 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. |
| Handle: | http://hdl.handle.net/11368/2892037 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevB.95.041408 |
| URL: | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.041408 |
| Appare nelle tipologie: | 1.1 Articolo in Rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| PhysRevB.95.041408.pdf | Articolo principale | Documento in Versione Editoriale | Digital Rights Management non definito | Administrator Richiedi una copia |
| MoTe2_supp_info_vers3.pdf | Supplemental material | Altro materiale allegato | Digital Rights Management non definito | Administrator Richiedi una copia |
http://hdl.handle.net/11368/2892037
