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  Extended van Hove Singularity and Superconducting Instability in Doped Graphene

McChesney, J. L., Bostwick, A., Ohta, T., Seyller, T., Horn, K., Gonzalez, J., et al. (2010). Extended van Hove Singularity and Superconducting Instability in Doped Graphene. Physical review letters, 104: 136803. doi:10.1103/PhysRevLett.104.136803.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-2530-F Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-2532-B
Genre: Journal Article

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 Creators:
McChesney, J. L.1, 2, Author
Bostwick, Aaron1, Author
Ohta, Taisuke1, 3, Author           
Seyller, Thomas4, Author
Horn, Karsten3, Author           
Gonzalez, J.5, Author
Rotenberg, Eli1, Author
Affiliations:
1Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA, ou_persistent22              
2Montana State University, Bozeman, Montana, USA, ou_persistent22              
3Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
4Institut für Physik der Kondensierten Materie, Universität Erlangen-Nürnberg, Erlangen, Germany, ou_persistent22              
5Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Serrano 123, 28006 Madrid, Spain, ou_persistent22              

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 Abstract: We have investigated the effects of doping on a single layer of graphene using angle-resolved photoemission spectroscopy. We show that many-body interactions severely warp the Fermi surface, leading to an extended van Hove singularity (EVHS) at the graphene M point. The ground state properties of graphene with such an EVHS are calculated, analyzing the competition between a magnetic instability and the tendency towards superconductivity. We find that the latter plays the dominant role as it is enhanced by the strong modulation of the interaction along the Fermi line, leading to an energy scale for the onset of the pairing instability as large as 1 meV when the Fermi energy is sufficiently close to the EVHS.

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Language(s): eng - English
 Dates: 2009-11-192010-04-02
 Publication Status: Issued
 Pages: 4
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.104.136803
URI: http://link.aps.org/doi/10.1103/PhysRevLett.104.136803
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Title: Physical review letters
Source Genre: Journal
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Publ. Info: Woodbury, N.Y., etc. : American Physical Society.
Pages: - Volume / Issue: 104 Sequence Number: 136803 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1