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Condensed Matter > Mesoscale and Nanoscale Physics

arXiv:1606.07957 (cond-mat)
[Submitted on 25 Jun 2016]

Title:Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS

Authors:D. Takane, Z. Wang, S. Souma, K. Nakayama, C. X. Trang, T. Sato, T. Takahashi, Yoichi Ando
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Abstract:We have performed angle-resolved photoemission spectroscopy on HfSiS, which has been predicted to be a topological line-node semimetal with square Si lattice. We found a quasi-two-dimensional Fermi surface hosting bulk nodal lines, alongside the surface states at the Brillouin-zone corner exhibiting a sizable Rashba splitting and band-mass renormalization due to many-body interactions. Most notably, we discovered an unexpected Dirac-like dispersion extending one-dimensionally in k space - the Dirac-node arc - near the bulk node at the zone diagonal. These novel Dirac states reside on the surface and could be related to hybridizations of bulk states, but currently we have no explanation for its origin. This discovery poses an intriguing challenge to the theoretical understanding of topological line-node semimetals.
Comments: 5 pages, 4 figures (paper proper) + 2 pages, figures (supplemental material)
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:1606.07957 [cond-mat.mes-hall]
  (or arXiv:1606.07957v1 [cond-mat.mes-hall] for this version)
  https://doi.org/10.48550/arXiv.1606.07957
Related DOI: https://doi.org/10.1103/PhysRevB.94.121108

Submission history

From: Seigo Souma [view email]
[v1] Sat, 25 Jun 2016 20:10:33 UTC (2,212 KB)
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