Abstract
We performed angle-resolved photoemission spectroscopy (ARPES) on CeBi which undergoes a two-step antiferromagnetic (AF) transition with temperature. Soft-x-ray ARPES revealed the inverted band structure at the $X$ point of bulk Brillouin zone for CeBi (and also for LaBi) as opposed to LaSb with noninverted band structure. Low-energy ARPES on CeBi revealed the Dirac-cone band at the $\overline{\mathrm{\ensuremath{\Gamma}}}$ point in the paramagnetic phase associated with the bulk band inversion. On the other hand, a double Dirac-cone band appears on entering the first AF phase at $T$ = 25 K, whereas a single Dirac-cone band recovers below the second AF transition at $T$ = 14 K. The present result suggests an intricate interplay between antiferromagnetism and topological surface states in CeBi.
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