Interaction phenomena in graphene seen through quantum capacitance

G. L. Yu, R. Jalil, Branson Belle, Alexander S. Mayorov, Peter Blake, Frederick Schedin, Sergey V. Morozov, Leonid A. Ponomarenko, F. Chiappini, S. Wiedmann, Uli Zeitler, Mikhail I. Katsnelson, A. K. Geim, Kostya S. Novoselov, Daniel C. Elias

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    Abstract

    Capacitance measurements provide a powerful means of probing the density of states. The technique has proved particularly successful in studying 2D electron systems, revealing a number of interesting many-body effects. Here, we use large-area high-quality graphene capacitors to study behavior of the density of states in this material in zero and high magnetic fields. Clear renormalization of the linear spectrum due to electron-electron interactions is observed in zero field. Quantizing fields lead to splitting of the spin- and valley-degenerate Landau levels into quartets separated by interaction-enhanced energy gaps. These many-body states exhibit negative compressibility but the compressibility returns to positive in ultrahigh B. The reentrant behavior is attributed to a competition between field-enhanced interactions and nascent fractional states.
    Original languageEnglish
    Pages (from-to)3282-3286
    Number of pages4
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume110
    Issue number9
    DOIs
    Publication statusPublished - 26 Feb 2013

    Keywords

    • 2D based heterostructures
    • Boron nitride
    • Fermi velocity-renormalization

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