Impurities or a neutral Fermi surface? A further examination of the low-energy ac optical conductivity of SmB${}_6$

N. J. Laurita, C. M. Morris, S. M. Koohpayeh +3

Recent experiments have uncovered evidence of low energy excitations in the bulk of SmB${}_6$ that are perhaps associated with unconventional quasiparticles, bringing into question w…