Details
| Original language | English |
|---|---|
| Article number | 053006 |
| Journal | New Journal of Physics |
| Volume | 13 |
| Publication status | Published - 3 May 2011 |
Abstract
The sheet plasmon of graphene on Ir(111) was investigated in this paper by means of high-resolution electron energy loss spectroscopy. The perfect lateral coordination of sp2-hybridized C atoms on a large scale is manifested by brilliant moiré diffraction images. However, the modulation of the graphene films caused by hybridization at the interface limits the lifetimes of the collective excitation modes. This modulation within the films can be lowered owing to intercalation of Na. Linear dispersion was found, but surprisingly the overall slope of the dispersion is not dependent on the chemical potential within the graphene films. The dispersion measured for graphene on Ir(111) is almost identical to that measured on SiC(0001), although the carrier densities differ by two orders of magnitude. This contradicts the model that the relevant carrier density for a two-dimensional plasmon is given by (2π) -1k2F
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: New Journal of Physics, Vol. 13, 053006, 03.05.2011.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Sheet plasmons in modulated graphene on Ir(111)
AU - Langer, Thomas
AU - Förster, D. F.
AU - Busse, Carsten
AU - Michely, T.
AU - Pfnür, Herbert
AU - Tegenkamp, Christoph
PY - 2011/5/3
Y1 - 2011/5/3
N2 - The sheet plasmon of graphene on Ir(111) was investigated in this paper by means of high-resolution electron energy loss spectroscopy. The perfect lateral coordination of sp2-hybridized C atoms on a large scale is manifested by brilliant moiré diffraction images. However, the modulation of the graphene films caused by hybridization at the interface limits the lifetimes of the collective excitation modes. This modulation within the films can be lowered owing to intercalation of Na. Linear dispersion was found, but surprisingly the overall slope of the dispersion is not dependent on the chemical potential within the graphene films. The dispersion measured for graphene on Ir(111) is almost identical to that measured on SiC(0001), although the carrier densities differ by two orders of magnitude. This contradicts the model that the relevant carrier density for a two-dimensional plasmon is given by (2π) -1k2F
AB - The sheet plasmon of graphene on Ir(111) was investigated in this paper by means of high-resolution electron energy loss spectroscopy. The perfect lateral coordination of sp2-hybridized C atoms on a large scale is manifested by brilliant moiré diffraction images. However, the modulation of the graphene films caused by hybridization at the interface limits the lifetimes of the collective excitation modes. This modulation within the films can be lowered owing to intercalation of Na. Linear dispersion was found, but surprisingly the overall slope of the dispersion is not dependent on the chemical potential within the graphene films. The dispersion measured for graphene on Ir(111) is almost identical to that measured on SiC(0001), although the carrier densities differ by two orders of magnitude. This contradicts the model that the relevant carrier density for a two-dimensional plasmon is given by (2π) -1k2F
UR - http://www.scopus.com/inward/record.url?scp=79956312776&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/13/5/053006
DO - 10.1088/1367-2630/13/5/053006
M3 - Article
AN - SCOPUS:79956312776
VL - 13
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 053006
ER -