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

Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) of LaSb and CeSb, a candidate of topological insulator. 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 topological-insulator phase - is absent in both LaSb and CeSb. Moreover, unlike the ARPES data obtained with soft-x-ray photons, those with vacuum ultraviolet (VUV) photons were found to suffer significant $k_z$ 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.

5 pages, 3 figures, to appear in Phys. Rev. B, Rapid Communications

References in corpus (4)

• Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS
• Presence of Exotic Electronic Surface States in LaBi and LaSb
• Evidence of topological insulator state in the semimetal LaBi
• Tuning the electronic and the crystalline structure of LaBi by pressure

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• Dirac nodal lines in the quasi-one-dimensional ternary telluride TaPtTe${}_5$
• Structural, electronic and topological properties of 3D TmBi compound
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• First-principles study on the electron-phonon coupling and magnetoresistance of LaBi under pressure
• Unconventional band splitting of CeSb in the devil's staircase transition
• Spin-orbital order and excitons in magnetoresistive HoBi