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Extremely high magnetoresistance (XMR) in the lanthanum monopnictides La$X$($X$ = Sb, Bi) has recently attracted interest in these compounds as candidatetopological materials. However, their perfect electron-hole compensationprovides an alternative explanation, so the possible role of topologicalsurface states requires verification through direct observation. Ourangle-resolved photoemission spectroscopy (ARPES) data reveal multipleDirac-like surface states near the Fermi level in both materials. Intriguingly,we have observed circular dichroism in both surface and near-surface bulkbands. Thus the spin-orbit coupling-induced orbital and spin angular momentumtextures may provide a mechanism to forbid backscattering in zero field,suggesting that surface and near-surface bulk bands may contribute strongly toXMR in La$X$. The extremely simple rock salt structure of these materials andthe ease with which high-quality crystals can be prepared suggests that theymay be an ideal platform for further investigation of topological matter.

Presence of Exotic Electronic Surface States in LaBi and LaSb