Manipulation of plasmon electron-hole coupling in quasi-free-standing epitaxial graphene layers

Download statistics - Document (COUNTER):

Langer, Thomas; Pfnür, Herbert; Tegenkamp, Christoph; Forti, Stiven; Emtsev, Konstantin; Starke, Ulrich: Manipulation of plasmon electron-hole coupling in quasi-free-standing epitaxial graphene layers. In: New Journal of Physics 14 (2012). DOI: http://dx.doi.org/10.1088/1367-2630/14/10/103045

Repository version

To cite the version in the repository, please use this identifier: https://doi.org/10.15488/61

Selected time period:

year: 
month: 

Sum total of downloads: 238




Thumbnail
Abstract: 
We have investigated the plasmon dispersion in quasi-free-standing monolayer graphene (QFMLG) and epitaxial monolayer graphene (MLG) layers by means of angle resolved electron energy loss spectroscopy. We have shown that various intrinsic p-and n-doping levels in QFMLG and MLG, respectively, do not lead to different overall slopes of the sheet plasmon dispersion, contrary to theoretical predictions. Only the coupling of the plasmon to single particle interband transitions becomes obvious in the plasmon dispersion by characteristic points of inflections, which coincide with the location of the Fermi level above or below the Dirac point. Further evidence is given by thermal treatment of the QFML graphene layer with gradual desorption of intercalated hydrogen, which shifts the chemical potential toward the Dirac point. From a detailed analysis of the plasmon dispersion, we deduce that the interaction strength between the plasmon and the electron-hole pair excitation is increased by about 30% in QFMLG compared to MLG, which is attributed to a modified dielectric environment of the graphene film.
License of this version: CC BY-NC-SA 3.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2012-10-29
Appears in Collections:Fakultät für Mathematik und Physik

distribution of downloads over the selected time period:

downloads by country:

pos. country downloads
total perc.
1 image of flag of Germany Germany 220 92.44%
2 image of flag of Russian Federation Russian Federation 5 2.10%
3 image of flag of United States United States 4 1.68%
4 image of flag of China China 3 1.26%
5 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 2 0.84%
6 image of flag of France France 2 0.84%
7 image of flag of No geo information available No geo information available 1 0.42%
8 image of flag of Korea, Republic of Korea, Republic of 1 0.42%

Further download figures and rankings:


Hinweis

Zur Erhebung der Downloadstatistiken kommen entsprechend dem „COUNTER Code of Practice for e-Resources“ international anerkannte Regeln und Normen zur Anwendung. COUNTER ist eine internationale Non-Profit-Organisation, in der Bibliotheksverbände, Datenbankanbieter und Verlage gemeinsam an Standards zur Erhebung, Speicherung und Verarbeitung von Nutzungsdaten elektronischer Ressourcen arbeiten, welche so Objektivität und Vergleichbarkeit gewährleisten sollen. Es werden hierbei ausschließlich Zugriffe auf die entsprechenden Volltexte ausgewertet, keine Aufrufe der Website an sich.

Search the repository


Browse