On effective holographic Mott insulators

Matteo Baggioli, Oriol Pujolàs

    Research output: Contribution to journalArticleResearchpeer-review

    26 Citations (Scopus)

    Abstract

    © 2016, The Author(s). We present a class of holographic models that behave effectively as prototypes of Mott insulators — materials where electron-electron interactions dominate transport phenomena. The main ingredient in the gravity dual is that the gauge-field dynamics contains self-interactions by way of a particular type of non-linear electrodynamics. The electrical response in these models exhibits typical features of Mott-like states: i) the low-temperature DC conductivity is unboundedly low; ii) metal-insulator transitions appear by varying various parameters; iii) for large enough self-interaction strength, the conductivity can even decrease with increasing doping (density of carriers) — which appears as a sharp manifestation of ‘traffic-jam’-like behaviour; iv) the insulating state becomes very unstable towards superconductivity at large enough doping. We exhibit some of the properties of the resulting insulator-superconductor transition, which is sensitive to the momentum dissipation rate in a specific way. These models imply a clear and generic correlation between Mott behaviour and significant effects in the nonlinear electrical response. We compute the nonlinear current-voltage curve in our model and find that indeed at large voltage the conductivity is largely reduced.
    Original languageEnglish
    Article number107
    JournalJournal of High Energy Physics
    Volume2016
    Issue number12
    DOIs
    Publication statusPublished - 1 Dec 2016

    Keywords

    • AdS-CFT Correspondence
    • Gauge-gravity correspondence
    • Holography and condensed matter physics (AdS/CMT)

    Fingerprint Dive into the research topics of 'On effective holographic Mott insulators'. Together they form a unique fingerprint.

    Cite this