We have performed micro-focused angle-resolved photoemission spectroscopy on
NdSb which exhibits the type-I antiferromagnetism below TN = 16 K. We succeeded
in selectively observing the band structure for all the three types of single-q
antiferromagnetic (AF) domains at the surface. We found that the two of three
surfaces whose AF-ordering vector lies within the surface plane commonly show
two-fold-symmetric surface states (SSs) around the bulk-band edges, whereas the
other surface with an out-of-plane AF-ordering vector displays
four-fold-symmetric shallow electronlike SS at the Brillouin-zone center. We
suggest that these SSs commonly originate from the combination of the PT
(space-inversion and time-reversal) symmetry breaking at the surface and the
band folding due to the AF order. The present results pave a pathway toward
understanding the relationship between the symmetry and the surface electronic
states in antiferromagnets.Comment: 20 pages, 5 figure