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Probing holographic flat bands at finite density

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arxiv 2304.08603 v2 pith:FEB6ZPSP submitted 2023-04-17 hep-th cond-mat.str-el

Nicolás Grandi , Vladimir Juričić , Ignacio Salazar Landea , Rodrigo Soto-Garrido This is my paper · ORCID
classification hep-thcond-mat.str-el
keywords flatphasechemicalholographicpotentialbandbandsfind
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Flat band electronic systems exhibit a rich landscape of correlation-driven phases. Motivated by these developments, in this paper, we explicitly include the effects of the chemical potential in a holographic model featuring approximately flat bands. In particular, we explore the phase diagram of this holographic flat band system as a function of the chemical potential. We find that at low temperatures and densities, the system features a nematic phase, transitioning into the Lifshitz phase as the chemical potential or temperature increases. To further characterize the ensuing phases, we investigate the optical conductivity and find that this observable shows strong anisotropies in the nematic phase.

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  1. Out-of-bounds hydrodynamics in holographic anisotropic Dirac semimetals

    hep-th 2025-07 conditional novelty 6.0 of 10

    A backreacted holographic model of an anisotropic Dirac semimetal gives η/s below the KSS bound in the quantum critical region, with low-temperature scaling η/s ~ T^0.56 tied to a Lifshitz dynamical exponent z ≈ 1.9.

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