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arxiv: 0809.3402 · v3 · submitted 2008-09-19 · ✦ hep-th · cond-mat.str-el

A Non-Fermi Liquid from a Charged Black Hole; A Critical Fermi Ball

classification ✦ hep-th cond-mat.str-el
keywords fermicriticalballblackchargeddefinedfunctionhole
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Using the AdS/CFT correspondence, we calculate a fermionic spectral function in a 2+1 dimensional non-relativistic quantum field theory which is dual to a gravitational theory in the $AdS_4$ background with a charged black hole. The spectral function shows no quasiparticle peak but the Fermi surface is still well defined. Interestingly, all momentum points inside the Fermi surface are critical and the gapless modes are defined in a {\it critical Fermi ball} in the momentum space.

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  1. Topological charge of fermions and Landau theory of Fermi liquid

    cond-mat.str-el 2026-04 conditional novelty 5.0

    The particle charge of a fermion is equivalent to its topological charge, which underpins the stability of the Fermi surface, the applicability of Landau Fermi liquid theory, and the Luttinger theorem in insulators.