Abstract
We construct a holographic model for a fermionic system on Q-lattice and compute the spectral function in the presence of a dipole coupling. Both key features of doped Mott insulators, the dynamical generation of a gap and spectral weight transfer, are observed when adjusting the value of the coupling parameter p. Of particular interest is that when the background is in a deep insulating phase, the Mott gap opens much easier with a smaller coupling parameter in comparison with a metallic background. The effects of lattice parameters on the width of the gap Δ/μ are studied and a turning point is observed near the critical regime of metal-insulator transitions of the background. Furthermore, the temperature dependence of the spectral function is studied. Finally, we also observe that the anisotropic Q-lattice generates anisotropic peaks with different magnitudes, indicating that insulating and metallic phases arise in different directions.
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Ling, Y., Liu, P., Niu, C. et al. Holographic fermionic system with dipole coupling on Q-lattice. J. High Energ. Phys. 2014, 149 (2014). https://doi.org/10.1007/JHEP12(2014)149
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DOI: https://doi.org/10.1007/JHEP12(2014)149