Interaction-Driven Spectrum Reconstruction in Bilayer Graphene

Details Interaction-Driven Spectrum Reconstruction in Bilayer Graphene Interaction-Driven Spectrum Reconstruction in Bilayer Graphene

2011-08-08

arxiv.org/abs/1108.1742v1

Science 333(6044) pp. 860-863 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1126/science.1208683

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. 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.

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