Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 15: Graphene: Structure and Theory I
HL 15.5: Vortrag
Montag, 26. März 2012, 16:00–16:15, EW 201
Effective screening and the plasmaron bands in Graphene — •Andrew Walter1,2, Aaron Bostwick1, Ki-Joon Jeon3, Florian Speck4, Marcus Ostler4, Thomas Seyller4, Luca Moreschini1, Young Jun Chang1,2, Marco Polini5, Reza Asgari6, Allan H. MacDonald7, Karsten Horn2, and Eli Rotenberg1 — 1Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA, — 2Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany, — 3School of Electrical Engineering, University of Ulsan, Namgu, Ulsan, 680-749, South Korea — 4Lehrstuhl fur Technische Physik, Universitat Erlangen-Nurnberg, Erwin-Rommel-Strasse 1, 91058 Erlangen, Germany — 5NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56126 Pisa, Italy. — 6School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran 19395-5531, Iran. — 7Dept. of Physics, Univ. of Texas at Austin, 1 University Station C1600, Austin TX 78712
Electron-plasmon coupling in graphene has recently been shown to give rise to a "plasmaron" quasiparticle excitation. The strength of this coupling is compared to the strength of enviromental screening for graphene on four different substrates. Comparison with G0W-RPA predictions are used to determine the effective dielectric constant of the underlying substrate layer indicating that plasmaron and electronic properties of graphene can be independently manipulated, an important aspect of a possible use in "plasmaronic" devices.