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  Observation of Plasmarons in Quasi-Freestanding Doped Graphene

Bostwick, A., Speck, F., Seyller, T., Horn, K., Polini, M., Asgari, R., et al. (2010). Observation of Plasmarons in Quasi-Freestanding Doped Graphene. Science, 328(5981), 999-1002. doi:10.1126/science.1186489.

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Bostwick, Aaron1, Author
Speck, Florian2, Author
Seyller, Thomas2, Author
Horn, Karsten3, Author           
Polini, Marco4, Author
Asgari, Reza5, Author
MacDonald, Allan H.6, Author
Rotenberg, Eli1, Author
Affiliations:
1Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA, ou_persistent22              
2Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse 1, 91058 Erlangen, Germany., ou_persistent22              
3Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
4National Enterprise for nanoScience and nanoTechnology, Istituto Nanoscienze–Consiglio Nazionale della Ricerche and Scuola Normale Superiore, I-56126 Pisa, Italy. , ou_persistent22              
5Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Serrano 123, 28006 Madrid, Spain, ou_persistent22              
6Department of Physics, University of Texas at Austin, 1 University Station C1600, Austin, TX 78712,USA, ou_persistent22              

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 Abstract: A hallmark of graphene is its unusual conical band structure that leads to a zero-energy band gap at a single Dirac crossing point. By measuring the spectral function of charge carriers in quasi-freestanding graphene with angle-resolved photoemission spectroscopy, we showed that at finite doping, this well-known linear Dirac spectrum does not provide a full description of the charge-carrying excitations. We observed composite “plasmaron” particles, which are bound states of charge carriers with plasmons, the density oscillations of the graphene electron gas. The Dirac crossing point is resolved into three crossings: the first between pure charge bands, the second between pure plasmaron bands, and the third a ring-shaped crossing between charge and plasmaron bands.

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Language(s): eng - English
 Dates: 2009-12-282010-04-012010-05-21
 Publication Status: Published in print
 Pages: 4
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 Table of Contents: -
 Rev. Type: Peer
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Title: Science
  Other : Science
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Association for the Advancement of Scienc
Pages: - Volume / Issue: 328 (5981) Sequence Number: - Start / End Page: 999 - 1002 Identifier: ISSN: 0036-8075
CoNE: https://pure.mpg.de/cone/journals/resource/991042748276600