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Tunability of the topological nodal-line semimetal phase in ZrSiX-type materials (X = S, Se, Te)
Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA..
Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA..
Princeton Univ, Joseph Henry Labs, Princeton, NJ 08544 USA.;Princeton Univ, Dept Phys, Princeton, NJ 08544 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 16, 161101Article in journal (Refereed) Published
Abstract [en]

The discovery of a topological nodal-line (TNL) semimetal phase in ZrSiS has invigorated the study of other members of this family. Here, we present a comparative electronic structure study of ZrSiX (where X = S, Se, Te) using angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. Our ARPES studies show that the overall electronic structure of ZrSiX materials comprises the diamond-shaped Fermi pocket, the nearly elliptical-shaped Fermi pocket, and a small electron pocket encircling the zone center (Gamma) point, the M point, and the X point of the Brillouin zone, respectively. We also observe a small Fermi surface pocket along the M-Gamma-M direction in ZrSiTe, which is absent in both ZrSiS and ZrSiSe. Furthermore, our theoretical studies show a transition from nodal-line to nodeless gapped phase by tuning the chalcogenide from S to Te in these material systems. Our findings provide direct evidence for the tunability of the TNL phase in ZrSiX material systems by adjusting the spin-orbit coupling strength via the X anion.

Place, publisher, year, edition, pages
2017. Vol. 95, no 16, 161101
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-331951DOI: 10.1103/PhysRevB.95.161101ISI: 000406297900001OAI: oai:DiVA.org:uu-331951DiVA: diva2:1151512
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationSwedish National Infrastructure for Computing (SNIC)
Available from: 2017-10-23 Created: 2017-10-23 Last updated: 2017-10-23Bibliographically approved

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Maldonado, PabloOppeneer, Peter M.

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