Small scale rotational disorder observed in epitaxial graphene on SiC(0001)

Andrew L. Walter, Aaron Bostwick, Florian Speck, Markus Ostler, Keun Su Kim, Young Jun Chang, Luca Moreschini, Davide Innocenti, Thomas Seyller, Karsten Horn, Eli Rotenberg

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Interest in the use of graphene in electronic devices has motivated an explosion in the study of this remarkable material. The simple, linear, Dirac cone band structure offers a unique possibility to investigate its finer details by angle-resolved photoelectron spectroscopy (ARPES). Indeed, ARPES has been performed on graphene grown on metal substrates but electronic applications require an insulating substrate. Epitaxial graphene grown by the thermal decomposition of silicon carbide (SiC) is an ideal candidate for this due to the large scale, uniform, graphene layers produced. The experimental spectral function of epitaxial graphene on SiC has been extensively studied. However, until now the cause of an anisotropy in the spectral width of the Fermi surface has not been determined. In the current work we show, by comparison of the spectral function to a semi-empirical model, that the anisotropy is due to small scale rotational disorder (∼± 0.15°) of graphene domains in graphene grown on SiC(0001) samples. The complicated shape described by the line-width is accurately reproduced by the semi-empirical model only when rotational disorder is included. While spectra from rare regions of the sample containing only one or two rotational domains is also presented. In addition to the direct benefit in the understanding of graphene's electronic structure this work suggests a mechanism to explain similar variations in related ARPES data.

Original languageEnglish
Article number023019
JournalNew Journal of Physics
Volume15
DOIs
Publication statusPublished - 2013 Feb 1

Fingerprint

silicon carbides
graphene
disorders
photoelectron spectroscopy
anisotropy
electronics
Fermi surfaces
thermal decomposition
explosions
cones
electronic structure
causes
metals

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Walter, A. L., Bostwick, A., Speck, F., Ostler, M., Kim, K. S., Chang, Y. J., ... Rotenberg, E. (2013). Small scale rotational disorder observed in epitaxial graphene on SiC(0001). New Journal of Physics, 15, [023019]. https://doi.org/10.1088/1367-2630/15/2/023019
Walter, Andrew L. ; Bostwick, Aaron ; Speck, Florian ; Ostler, Markus ; Kim, Keun Su ; Chang, Young Jun ; Moreschini, Luca ; Innocenti, Davide ; Seyller, Thomas ; Horn, Karsten ; Rotenberg, Eli. / Small scale rotational disorder observed in epitaxial graphene on SiC(0001). In: New Journal of Physics. 2013 ; Vol. 15.
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Walter, AL, Bostwick, A, Speck, F, Ostler, M, Kim, KS, Chang, YJ, Moreschini, L, Innocenti, D, Seyller, T, Horn, K & Rotenberg, E 2013, 'Small scale rotational disorder observed in epitaxial graphene on SiC(0001)', New Journal of Physics, vol. 15, 023019. https://doi.org/10.1088/1367-2630/15/2/023019

Small scale rotational disorder observed in epitaxial graphene on SiC(0001). / Walter, Andrew L.; Bostwick, Aaron; Speck, Florian; Ostler, Markus; Kim, Keun Su; Chang, Young Jun; Moreschini, Luca; Innocenti, Davide; Seyller, Thomas; Horn, Karsten; Rotenberg, Eli.

In: New Journal of Physics, Vol. 15, 023019, 01.02.2013.

Research output: Contribution to journalArticle

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