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Holographic Fermi and Non-Fermi Liquids with Transitions in Dilaton Gravity

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arxiv 1105.1162 v3 pith:DPZPB5QI submitted 2011-05-05 hep-th cond-mat.str-el

Holographic Fermi and Non-Fermi Liquids with Transitions in Dilaton Gravity

classification hep-th cond-mat.str-el
keywords functiontwo-pointblackbranedilatonextremalfermifermionic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the two-point function for fermionic operators in a class of strongly coupled systems using the gauge-gravity correspondence. The gravity description includes a gauge field and a dilaton which determines the gauge coupling and the potential energy. Extremal black brane solutions in this system typically have vanishing entropy. By analyzing a charged fermion in these extremal black brane backgrounds we calculate the two-point function of the corresponding boundary fermionic operator. We find that in some region of parameter space it is of Fermi liquid type. Outside this region no well-defined quasi-particles exist, with the excitations acquiring a non-vanishing width at zero frequency. At the transition, the two-point function can exhibit non-Fermi liquid behaviour.

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    Isospin-imbalanced strongly coupled dense matter is shown, via holography, to obey non-Abelian hydrodynamic predictions for current correlators up to the chemical-potential scale, beyond the standard ω,k ≪ T regime.