Tunability of the topological nodal-line semimetal phase in ZrSiX-type materials

M. Mofazzel Hosen; Klauss Dimitri; Ilya Belopolski; Pablo Maldonado; Raman Sankar; Nagendra Dhakal; Gyanendra Dhakal; Taiason Cole; Peter M. Oppeneer; Dariusz Kaczorowski; Fangcheng Chou; M. Zahid Hasan; Tomasz Durakiewicz; Madhab Neupane

doi:10.1103/physrevb.95.161101

arXiv · 1612.07018

Tunability of the topological nodal-line semimetal phase in ZrSiX-type materials

M. Mofazzel Hosen·Klauss Dimitri·Ilya Belopolski·Pablo Maldonado·Raman Sankar·Nagendra Dhakal·Gyanendra Dhakal·Taiason Cole·Peter M. Oppeneer·Dariusz Kaczorowski·Fangcheng Chou·M. Zahid Hasan·Tomasz Durakiewicz·Madhab Neupane

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Abstract

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 of the diamond-shaped Fermi pocket, the nearly elliptical-shaped Fermi pocket, and a small electron pocket encircling the zone center ($Γ$) point, the M point, and the X point of the Brillouin zone, respectively. We also observe a small Fermi surface pocket along the M-$Γ$-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 (SOC) strength via the X anion.

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M. Mofazzel Hosen, Klauss Dimitri, Ilya Belopolski, Pablo Maldonado, Raman Sankar, Nagendra Dhakal, Gyanendra Dhakal, Taiason Cole, Peter M. Oppeneer, Dariusz Kaczorowski, Fangcheng Chou, M. Zahid Hasan, Tomasz Durakiewicz, Madhab Neupane. 2016-12-21. Tunability of the topological nodal-line semimetal phase in ZrSiX-type materials. https://doi.org/10.1103/physrevb.95.161101

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