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Interaction phenomena in graphene seen through quantum capacitance
Yu, G L; Jalil, R; Belle, B; Mayorov, A S; Blake, P; Schedin, F; Morozov, S V; Ponomarenko, L A; Chiappini, F; Wiedmann, S; Zeitler, U; Katsnelson, M I; Geim, A K; Novoselov, K S; Elias, D C
Proceedings of the National Academy of Sciences of the United States of America. 2013;110(9):3282-3286.
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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.
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2-dimensional electron; 2d based heterostructures; boron nitride; compressibility; density; fermi velocity-renormalization; fermi-liquid behavior; gas; heterostructures; states; suspended graphene
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