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Lattice potentials and fermions in holographic non Fermi-liquids: hybridizing local quantum criticality

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Abstract

We study lattice effects in strongly coupled systems of fermions at a finite density described by a holographic dual consisting of fermions in Anti-de-Sitter space in the presence of a Reissner-Nordström black hole. The lattice effect is encoded by a periodic modulation of the chemical potential with a wavelength of order of the intrinsic length scales of the system. This corresponds with a highly complicated “band structure” problem in AdS, which we only manage to solve in the weak potential limit. The “domain wall” fermions in AdS encoding for the Fermi surfaces in the boundary field theory diffract as usually against the periodic lattice, giving rise to band gaps. However, the deep infrared of the field theory as encoded by the near horizon AdS2 geometry in the bulk reacts in a surprising way to the weak potential. The hybridization of the fermions bulk dualizes into a linear combination of CFT1 “local quantum critical” propagators in the bulk, characterized by momentum dependent exponents displaced by lattice Umklapp vectors. This has the consequence that the metals showing quasi-Fermi surfaces cannot be localized in band insulators. In the AdS2 metal regime, where the conformal dimension of the fermionic operator is large and no Fermi surfaces are present at low T/μ, the lattice gives rise to a characteristic dependence of the energy scaling as a function of momentum. We predict crossovers from a high energy standard momentum AdS2 scaling to a low energy regime where exponents found associated with momenta “backscattered” to a lower Brillioun zone in the extended zone scheme. We comment on how these findings can be used as a unique fingerprint for the detection of AdS2 like “pseudogap metals” in the laboratory.

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Authors and Affiliations

  1. Institute Lorentz for Theoretical Physics, Leiden University, P.O. Box 9506, Leiden, 2300RA, The Netherlands

    Yan Liu, Koenraad Schalm, Ya-Wen Sun & Jan Zaanen

Authors
  1. Yan Liu
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  2. Koenraad Schalm
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  3. Ya-Wen Sun
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  4. Jan Zaanen
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Correspondence to Ya-Wen Sun.

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ArXiv ePrint: 1205.5227

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Liu, Y., Schalm, K., Sun, YW. et al. Lattice potentials and fermions in holographic non Fermi-liquids: hybridizing local quantum criticality. J. High Energ. Phys. 2012, 36 (2012). https://doi.org/10.1007/JHEP10(2012)036

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