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We have performed micro-focused angle-resolved photoemission spectroscopy onNdSb which exhibits the type-I antiferromagnetism below TN = 16 K. We succeededin selectively observing the band structure for all three types of single-qantiferromagnetic (AF) domains at the surface. We found that two of the threesurfaces whose AF-ordering vector lies within the surface plane commonly showtwofold symmetric surface states (SSs) around the bulk-band edges, whereas theother surface with an out-of-plane AF-ordering vector displays fourfoldsymmetric shallow electronlike SS at the Brillouin-zone center. We suggest thatthese SSs commonly originate from the combination of the PT (space-inversionand time-reversal) symmetry breaking at the surface and the band folding due tothe AF order. The present results pave a pathway toward understanding therelationship between the symmetry and the surface electronic states inantiferromagnets.

Unusual surface states associated with the PT-symmetry breaking and antiferromagnetic band folding in NdSb