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  Coexisting massive and massless Dirac fermions in symmetry-broken bilayer graphene

Kim, K. S., Walter, A. L., Moreschini, L., Seyller, T., Horn, K., Rotenberg, E., et al. (2013). Coexisting massive and massless Dirac fermions in symmetry-broken bilayer graphene. Nature Materials, 12(10), 887-892. doi:10.1038/nmat3717.

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Kim, Keun Su1, 2, Author           
Walter, Andrew L.3, Author
Moreschini, Luca2, Author
Seyller, Thomas4, Author
Horn, Karsten1, Author           
Rotenberg, Eli2, Author
Bostwick, Aaron2, Author
Affiliations:
1Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
2Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA, ou_persistent22              
3Donostia International Physics Centre, Manuel Lardizábal 4, E-20018 San Sebastián, Spain, ou_persistent22              
4Institut für Physik, Technische Universität Chemnitz, Reichenhainer Str. 70, 09126 Chemnitz, Germany, ou_persistent22              

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 Abstract: Charge carriers in bilayer graphene are widely believed to be massive Dirac fermions that have a bandgap tunable by a transverse electric field. However, a full transport gap, despite its importance for device applications, has not been clearly observed in gated bilayer graphene, a long-standing puzzle. Moreover, the low-energy electronic structure of bilayer graphene is widely held to be unstable towards symmetry breaking either by structural distortions, such as twist, strain, or electronic interactions that can lead to various ground states. Which effect dominates the physics at low energies is hotly debated. Here we show both by direct band-structure measurements and by calculations that a native imperfection of bilayer graphene, a distribution of twists whose size is as small as ~0.1°, is sufficient to generate a completely new electronic spectrum consisting of massive and massless Dirac fermions. The massless spectrum is robust against strong electric fields, and has a unusual topology in momentum space consisting of closed arcs having an exotic chiral pseudospin texture, which can be tuned by varying the charge density. The discovery of this unusual Dirac spectrum not only complements the framework of massive Dirac fermions, widely relevant to charge transport in bilayer graphene, but also supports the possibility of valley Hall transport.

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Language(s): eng - English
 Dates: 2012-12-122013-06-202013-07-282013-10
 Publication Status: Published in print
 Pages: 6
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/nmat3717
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Title: Nature Materials
  Other : Nat. Mater.
Source Genre: Journal
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Publ. Info: London, UK : Nature Pub. Group
Pages: - Volume / Issue: 12 (10) Sequence Number: - Start / End Page: 887 - 892 Identifier: ISSN: 1476-1122
CoNE: https://pure.mpg.de/cone/journals/resource/111054835734000