Dynamically Generated Mott Gap from Holography
Oct, 2010
Citations per year
Abstract: (arXiv)
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.Note:
- 4 pages, 4 figures (Version to appear in PRL)
- 11.25.Tq
- 04.70.Bw
- 71.30.+h
- fermion: correlation function
- density: spectral
- gravitation: coupling
- coupling: nonminimal
- gap
- holography
- dipole
References(22)
Figures(6)