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We use holography to compute spectral functions of certain fermionicoperators in three different finite-density, zero-temperature states of ABJMtheory with a broken U(1) symmetry. In each of the three states, dual topreviously studied domain wall solutions of four-dimensional gaugedsupergravity, we find that the fermionic operators have gapped spectra. In onecase the gap can be traced to the small charge of the fermions, while in theother cases it is due to a particular interaction that mixes particles andholes.

Gapped Fermions in Top-down Holographic Superconductors