Dynamically Generated Gap from Holography: Mottness from a Black Hole

Abstract

In the fermionic sector of top-down approaches to holographic systems, one generically finds that the fermions are coupled to gravity and gauge fields in a variety of ways, beyond minimal coupling. In this paper, we take one such interaction -- a Pauli, or dipole, interaction -- and study its effects on fermion correlators. We find that this interaction modifies the fermion spectral density in a remarkable way. As we change the strength of the interaction, we find that spectral weight is transferred between bands, and beyond a critical value, a hard gap emerges in the fermion density of states. A possible interpretation of this bulk interaction then is that it drives the dynamical formation of a (Mott) gap, in the absence of continuous symmetry breaking.

4 pages, 4 figures (Version to appear in PRL)

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• Holographic Spectral Functions with Momentum Relaxation
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• Dynamic gap from holographic fermions in charged dilaton black branes
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• Holographic Fermi Liquids in a Spontaneously Generated Lattice
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• Nodal-antinodal dichotomy from anisotropic quantum critical continua in holographic models
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