Holographic models with non-minimal interactions produce new quasi-particle spectra that explain pinning peaks as arising from vortex formation due to interaction-induced anomalous magnetic moments.
Dynamically Generated Gap from Holography: Mottness from a Black Hole
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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.
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A semi-holographic model couples a fermion to a holographic composite sector, yielding poles-zeros duality in the Green's function that distinguishes metallic and Mott-insulating phases through choice of quantization.
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Interaction induced quasi-particle spectrum and the origin of the pinning peak in holography
Holographic models with non-minimal interactions produce new quasi-particle spectra that explain pinning peaks as arising from vortex formation due to interaction-induced anomalous magnetic moments.
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Poles-zeros duality in semi-holographic Mott insulators
A semi-holographic model couples a fermion to a holographic composite sector, yielding poles-zeros duality in the Green's function that distinguishes metallic and Mott-insulating phases through choice of quantization.