Observation of topological nodal fermion semimetal phase in ZrSiS

Madhab Neupane, Ilya Belopolski, M. Mofazzel Hosen, Daniel S. Sanchez, Raman Sankar, Maria Szlawska, Su Yang Xu, Klauss Dimitri, Nagendra Dhakal, Pablo Maldonado, Peter M. Oppeneer, Dariusz Kaczorowski, Fangcheng Chou, M. Zahid Hasan, Tomasz Durakiewicz

Research output: Contribution to journalArticlepeer-review

247 Scopus citations

Abstract

Unveiling new topological phases of matter is one of the current objectives in condensed matter physics. Recent experimental discoveries of Dirac and Weyl semimetals prompt the search for other exotic phases of matter. Here we present a systematic angle-resolved photoemission spectroscopy study of ZrSiS, a prime topological nodal semimetal candidate. Our wider Brillouin zone (BZ) mapping shows multiple Fermi surface pockets such as the diamond-shaped Fermi surface, elliptical-shaped Fermi surface, and a small electron pocket encircling at the zone center (Γ) point, the M point, and the X point of the BZ, respectively. We experimentally establish the spinless nodal fermion semimetal phase in ZrSiS, which is supported by our first-principles calculations. Our findings evidence that the ZrSiS-type of material family is a new platform on which to explore exotic states of quantum matter; these materials are expected to provide an avenue for engineering two-dimensional topological insulator systems.

Original languageEnglish (US)
Article number201104
JournalPhysical Review B
Volume93
Issue number20
DOIs
StatePublished - May 11 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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