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We present the results of high-resolution valence-band photoemissionspectroscopic study of SmB6 which shows evidence for a V-shaped density ofstates of surface origin within the bulk gap. The spectroscopy data isinterpreted in terms of the existence of heavy 4f surface states, which may beuseful in resolving the controversy concerning the disparate surfaceFermi-surface velocities observed in experiments. Most importantly, we findthat the temperature dependence of the valence-band spectrum indicates that asmall feature appears at a binding energy of about -9 meV at low temperatures.We attribute this feature to a resonance caused by the spin-exciton scatteringin SmB6 which destroys the protection of surface states due to time-reversalinvariance and spin-momentum locking. The existence of a low-energyspin-exciton may be responsible for the scattering which suppresses theformation of coherent surface quasi-particles and the appearance of thesaturation of the resistivity to temperatures much lower than the coherencetemperature associated with the opening of the bulk gap.

The Effects of Spin-Excitons on the Surface States of SmB6: A Photoemission Study