On holographic disorder-driven metal-insulator transitions

Matteo Baggioli, Oriol Pujolàs

    Research output: Contribution to journalArticleResearchpeer-review

    27 Citations (Scopus)

    Abstract

    © 2017, The Author(s). We give a minimal holographic model of a disorder-driven metal-insulator transition. It consists in a CFT with a charge sector and a translation-breaking sector that interact in the most generic way allowed by the symmetries and by dynamical consistency. In the gravity dual, it reduces to a Massive Gravity-Maxwell model with a new direct coupling between the gauge field and the metric that is allowed when gravity is massive. We show that the effect of this coupling is to decrease the DC electrical conductivity generically. This gives a nontrivial check that holographic massive gravity can be consistently interpreted as disorder from the CFT perspective. The suppression of the conductivity happens to such an extent that it does not obey any lower bound and it can be very small in the insulating phase. In some cases, the large disorder limit produces gradient instabilities that hint at the formation of modulated phases.
    Original languageEnglish
    Article number40
    JournalJournal of High Energy Physics
    Volume2017
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2017

    Keywords

    • AdS-CFT Correspondence
    • Black Holes
    • Holography and condensed matter physics (AdS/CMT)

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