Anomalous Spectral Features of a Neutral Bilayer Graphene

Graphene and its bilayer are two-dimensional systems predicted to show exciting many-body effects near the neutrality point. The ideal tool to investigate spectrum reconstruction effects is angle-resolved photoemission spectroscopy (ARPES) as it probes directly the band structure with information ab...

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Bibliographic Details
Published in:Scientific reports 2015-05, Vol.5 (1), p.10025-10025, Article 10025
Main Authors: Cheng, C.-M., Xie, L.F., Pachoud, A., Moser, H.O., Chen, W., Wee, A.T.S., Castro Neto, A.H., Tsuei, K.-D., Özyilmaz, B.
Format: Article
Language:English
Subjects:
140/146
639/301/357/918
639/766/119/544
639/766/119/995
Energy
Graphene
Humanities and Social Sciences
multidisciplinary
Phase transitions
Physics
Probes
Science
Spectroscopy
Spectrum analysis
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Summary:Graphene and its bilayer are two-dimensional systems predicted to show exciting many-body effects near the neutrality point. The ideal tool to investigate spectrum reconstruction effects is angle-resolved photoemission spectroscopy (ARPES) as it probes directly the band structure with information about both energy and momentum. Here we reveal, by studying undoped exfoliated bilayer graphene with ARPES, two essential aspects of its many-body physics: the electron-phonon scattering rate has an anisotropic k -dependence and the type of electronic liquid is non-Fermi liquid. The latter behavior is evident from an observed electron-electron scattering rate that scales linearly with energy from 100 meV to 600 meV and that is associated with the proximity of bilayer graphene to a two-dimensional quantum critical point of competing orders.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep10025