In holographic superfluids with axion-induced momentum relaxation, the finite-momentum instability is strengthened and low-energy spectral weight, including Fermi shells, is suppressed.
Gapped Fermions in Top-down Holographic Superconductors
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abstract
We use holography to compute spectral functions of certain fermionic operators in three different finite-density, zero-temperature states of ABJM theory with a broken U(1) symmetry. In each of the three states, dual to previously studied domain wall solutions of four-dimensional gauged supergravity, we find that the fermionic operators have gapped spectra. In one case the gap can be traced to the small charge of the fermions, while in the other cases it is due to a particular interaction that mixes particles and holes.
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Spectral weight in holography with momentum relaxation
In holographic superfluids with axion-induced momentum relaxation, the finite-momentum instability is strengthened and low-energy spectral weight, including Fermi shells, is suppressed.