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28 March 2024
 
  » arxiv » 1302.3967

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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 ;
Date 16 Feb 2013
AbstractCapacitance 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.
Source arXiv, 1302.3967
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