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  Effective screening and the plasmaron bands in Graphene.

Walter, A. L., Bostwick, A., Jeon, K.-J., Speck, F., Ostler, M., Seyller, T., et al. (2011). Effective screening and the plasmaron bands in Graphene. Physical Review B, 84(8): 085410. doi:10.1103/PhysRevB.84.085410.

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 Creators:
Walter, Andrew L.1, 2, Author           
Bostwick, Aaron1, Author
Jeon, Ki-Joon3, Author
Speck, Florian4, Author
Ostler, Markus4, Author
Seyller, Thomas4, Author
Moreschini, Luca1, Author
Chang, Jun Young1, 5, Author           
Polini, Marco6, Author
Asgari, Reza7, Author
MacDonald, Allan H.8, Author
Horn, Karsten2, Author           
Rotenberg, Eli1, Author
Affiliations:
1Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA , ou_634547              
2Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
3School of Electrical Engineering, University of Ulsan, Namgu, Ulsan 680-749, Republic of Korea , ou_persistent22              
4Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse 1, 91058 Erlangen, Germany , ou_persistent22              
5Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
6NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56126 Pisa, Italy, ou_persistent22              
7School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran 19395-5531, Iran, ou_persistent22              
8Department of Applied Physics, Hanyang University, Ansan, Gyeonggi-do 426-791, Republic of Korea , ou_persistent22              

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 Abstract: Electron-plasmon coupling in graphene has been shown recently to give rise to a “plasmaron” quasiparticle excitation. The strength of this coupling has been predicted to depend on the effective screening, which in turn is expected to depend on the dielectric environment of the graphene sheet. Here we compare the strength of environmental screening for graphene on four different substrates by evaluating the separation of the plasmaron bands from the hole bands using angle-resolved photoemission spectroscopy. Comparison with G0W-random phase approximation predictions are used to determine the effective dielectric constant of the underlying substrate layer. We also show that plasmaron and electronic properties of graphene can be independently manipulated, an important aspect of a possible use in “plasmaronic” devices.

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Language(s): eng - English
 Dates: 20112011-06-282011-08-222011-08-22
 Publication Status: Published in print
 Pages: 8
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 Rev. Type: Peer
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Title: Physical Review B
Source Genre: Journal
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Publ. Info: Woodbury, NY : Published by the American Physical Society through the American Institute of Physics
Pages: - Volume / Issue: 84 (8) Sequence Number: 085410 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008