Interaction-Driven Spectrum Reconstruction in Bilayer Graphene

A correlated-electron phase was observed at low temperatures in suspended graphene bilayers with high carrier mobilities. The nematic phase transition in electronic liquids, driven by Coulomb interactions, represents a new class of strongly correlated electronic ground states. We studied suspended samples of bilayer graphene, annealed so that it achieves very high quasiparticle mobilities (greater than 106 square centimers per volt-second). Bilayer graphene is a truly two-dimensional material with complex chiral electronic spectra, and the high quality of our samples allowed us to observe strong spectrum reconstructions and electron topological transitions that can be attributed to a nematic phase transition and a decrease in rotational symmetry. These results are especially surprising because no interaction effects have been observed so far in bilayer graphene in the absence of an applied magnetic field.

• Publication year

  2011

• Venue

  Science

• Publication date

  2011-08-08

• Fields of study

  Medicine, Physics

• Identifiers
  DOI 10.1126/science.1208683arXiv 1108.1742PMID 21836011
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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