Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2

Domenico Di Sante; Pranab Kumar Das; C. Bigi; Z. Ergönenc; Gürtler N.; J. A. Krieger; T. Schmitt; M. N. Ali; Graziano Rossi; R. Thomale; C. Franchini; Silvia Picozzi; Jun Fujii; V. N. Strocov; G. Sangiovanni; I. Vobornik; R. J. Cava; G. Panaccione

doi:10.1103/PhysRevLett.119.026403

Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2

Domenico Di Sante (Corresponding author), Pranab Kumar Das (Corresponding author), C. Bigi, Z. Ergönenc, Gürtler N., J. A. Krieger, T. Schmitt, M. N. Ali, Graziano Rossi, R. Thomale, C. Franchini, Silvia Picozzi, Jun Fujii, V. N. Strocov, G. Sangiovanni, I. Vobornik, R. J. Cava, G. Panaccione

Computational Materials Physics

Publications: Contribution to journal › Article › Peer Reviewed

Abstract

By combining bulk sensitive soft-x-ray angular-resolved photoemission spectroscopy and first-principles 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 two-dimensional 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.

Original language	English
Article number	026403
Number of pages	6
Journal	Physical Review Letters
Volume	119
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.119.026403
Publication status	Published - 14 Jul 2017

Funding

D. D. S., G. S., and R. T. acknowledge the German Research Foundation (DFG-SFB 1170 Tocotronics), ERC-StG-336012-Thomale-TOPOLECTRICS, NSF PHY-1125915 and the SuperMUC system at the Leibniz Supercomputing Centre under the Project-ID pr94vu. The soft-x-ray ARPES experiment was carried out at the ADRESS beam line [41,42] at the Swiss Light Source, Paul Scherrer Institute, Switzerland. UV-ARPES experiment was performed at APE-IOM beam line at the Elettra-Sincrotrone Trieste facility (Italy) [43]. The work at CNR-SPIN and CNR-IOM was performed within the framework of the nanoscience foundry and fine analysis (NFFA-MIUR Italy) project. The research in Vienna was supported by the Austrian Science Fund (Grant No. I1490-N19). Computing time at the Vienna Scientific Cluster (VSC3) is gratefully acknowledged. The research at Princeton was supported by the US NSF MRSEC Program Grant No. DMR-1420541. J. A. K. was supported by the Swiss National Science Foundation (SNF-Grant No. 200021-165910).

Austrian Fields of Science 2012

103025 Quantum mechanics
103036 Theoretical physics
103015 Condensed matter
103009 Solid state physics

Keywords

MAGNETORESISTANCE
SPECTROSCOPIES
BEAMLINE
ADRESS

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10.1103/PhysRevLett.119.026403

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Di Sante, D., Das, P. K., Bigi, C., Ergönenc, Z., N., G., Krieger, J. A., Schmitt, T., Ali, M. N., Rossi, G., Thomale, R., Franchini, C., Picozzi, S., Fujii, J., Strocov, V. N., Sangiovanni, G., Vobornik, I., Cava, R. J., & Panaccione, G. (2017). Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2. Physical Review Letters, 119(2), Article 026403. https://doi.org/10.1103/PhysRevLett.119.026403

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abstract = "By combining bulk sensitive soft-x-ray angular-resolved photoemission spectroscopy and first-principles 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 two-dimensional 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.",

keywords = "MAGNETORESISTANCE, SPECTROSCOPIES, BEAMLINE, ADRESS",

author = "\{Di Sante\}, Domenico and Das, \{Pranab Kumar\} and C. Bigi and Z. Erg{\"o}nenc and G{\"u}rtler N. and Krieger, \{J. A.\} and T. Schmitt and Ali, \{M. N.\} and Graziano Rossi and R. Thomale and C. Franchini and Silvia Picozzi and Jun Fujii and Strocov, \{V. N.\} and G. Sangiovanni and I. Vobornik and Cava, \{R. J.\} and G. Panaccione",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

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doi = "10.1103/PhysRevLett.119.026403",

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Di Sante, D, Das, PK, Bigi, C, Ergönenc, Z, N., G, Krieger, JA, Schmitt, T, Ali, MN, Rossi, G, Thomale, R, Franchini, C, Picozzi, S, Fujii, J, Strocov, VN, Sangiovanni, G, Vobornik, I, Cava, RJ & Panaccione, G 2017, 'Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2', Physical Review Letters, vol. 119, no. 2, 026403. https://doi.org/10.1103/PhysRevLett.119.026403

TY - JOUR

T1 - Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2

AU - Di Sante, Domenico

AU - Das, Pranab Kumar

AU - Bigi, C.

AU - Ergönenc, Z.

AU - N., Gürtler

AU - Krieger, J. A.

AU - Schmitt, T.

AU - Ali, M. N.

AU - Rossi, Graziano

AU - Thomale, R.

AU - Franchini, C.

AU - Picozzi, Silvia

AU - Fujii, Jun

AU - Strocov, V. N.

AU - Sangiovanni, G.

AU - Vobornik, I.

AU - Cava, R. J.

AU - Panaccione, G.

PY - 2017/7/14

Y1 - 2017/7/14

N2 - By combining bulk sensitive soft-x-ray angular-resolved photoemission spectroscopy and first-principles 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 two-dimensional 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.

AB - By combining bulk sensitive soft-x-ray angular-resolved photoemission spectroscopy and first-principles 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 two-dimensional 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.

KW - MAGNETORESISTANCE

KW - SPECTROSCOPIES

KW - BEAMLINE

KW - ADRESS

UR - https://arxiv.org/abs/1702.05322

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M3 - Article

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VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 026403

ER -

Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2

Abstract

Funding

Austrian Fields of Science 2012

Keywords

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