Journal
PHYSICAL REVIEW B
Volume 96, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.041120
Keywords
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Funding
- JSPS KAKENHI [JP15H05853, JP17H01139, JP15H02105, JP26287071, JP25287079]
- KEK-PF [2015S2-003, 2016G555]
- UVSOR [28-542, 28-828]
- Grants-in-Aid for Scientific Research [16H02115, 15H02105, 16K05033, 15H02109, 26287071] Funding Source: KAKEN
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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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