Universität zu Köln

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. and Grioni, M. (2017). Persistence of a surface state arc in the topologically trivial phase of MoTe2. Phys. Rev. B, 95 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Crepaldi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Autes, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sterzi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Manzoni, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zacchigna, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cilento, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vobornik, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fujii, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bugnon, Ph. UNSPECIFIED UNSPECIFIED UNSPECIFIED Magrez, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Berger, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yazyev, O. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grioni, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-242052
DOI:	10.1103/PhysRevB.95.041408
Journal or Publication Title:	Phys. Rev. B
Volume:	95
Number:	4
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WEYL FERMION SEMIMETAL; SUPERCONDUCTIVITY; NODES Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24205