Data di Pubblicazione:
2017
Citazione:
Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2 / D. Di Sante, P.K. Das, C. Bigi, Z. Ergönenc, N. Gürtler, J..A. Krieger, T. Schmitt, M.N. Ali, G. Rossi, R. Thomale, C. Franchini, S. Picozzi, J. Fujii, V.N. Strocov, G. Sangiovanni, I. Vobornik, R.J. Cava, G. Panaccione. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 119:2(2017 Jul 14), pp. 026403.1-026403.6.
Abstract:
By combining bulk sensitive soft-x-ray angular-resolved photoemission spectroscopy and firstprinciples
calculations we explored the bulk electron states of WTe2, a candidate type-II Weyl semimetal
featuring a large nonsaturating magnetoresistance. Despite the layered geometry suggesting a twodimensional
electronic structure, we directly observe a three-dimensional electronic dispersion.We report a
band dispersion in the reciprocal direction perpendicular to the layers, implying that electrons can also
travel coherently when crossing from one layer to the other. The measured Fermi surface is characterized by
two well-separated electron and hole pockets at either side of the Γ point, differently from previous more
surface sensitive angle-resolved photoemission spectroscopy experiments that additionally found a
pronounced quasiparticle weight at the zone center. Moreover, we observe a significant sensitivity of
the bulk electronic structure of WTe2 around the Fermi level to electronic correlations and renormalizations
due to self-energy effects, previously neglected in first-principles descriptions.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
topological insulators; band structure; volume states and surface states; ARPES
Elenco autori:
D. Di Sante, P.K. Das, C. Bigi, Z. Ergönenc, N. Gürtler, J..A. Krieger, T. Schmitt, M.N. Ali, G. Rossi, R. Thomale, C. Franchini, S. Picozzi, J. Fujii, V.N. Strocov, G. Sangiovanni, I. Vobornik, R.J. Cava, G. Panaccione
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