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Three-dimensional band structure of LaSb and CeSb: Absence of band inversion

H. Oinuma, S. Souma, D. Takane, T. Nakamura, K. Nakayama, T. Mitsuhashi, K. Horiba, H. Kumigashira, M. Yoshida, A. Ochiai, T. Takahashi, and T. Sato
Phys. Rev. B 96, 041120(R) – Published 18 July 2017

Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) of LaSb and CeSb, a candidate of topological insulators. Using soft-x-ray photons, we have accurately determined the three-dimensional bulk band structure and revealed that the band inversion at the Brillouin-zone corner, a prerequisite for realizing the topological-insulator phase, is absent in both LaSb and CeSb. Moreover, unlike the ARPES data obtained with soft-x-ray photons, those with VUV photons were found to suffer significant kz broadening. These results suggest that LaSb and CeSb are topologically trivial semimetals, and unusual Dirac-cone-like states observed with VUV photons are not of the topological origin.

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  • Received 16 June 2017

DOI:https://doi.org/10.1103/PhysRevB.96.041120

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Oinuma1, S. Souma2,3, D. Takane1, T. Nakamura1, K. Nakayama1, T. Mitsuhashi1,4, K. Horiba4, H. Kumigashira1,4, M. Yoshida5, A. Ochiai1, T. Takahashi1,2,3, and T. Sato1,2

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 2Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
  • 3WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 4Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
  • 5Max-Planck-Institute for Solid State Research, Heisenbergstrsse 1, 70569 Stuttgart, Germany

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Issue

Vol. 96, Iss. 4 — 15 July 2017

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