Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Science 13 July 2007:
Vol. 317. no. 5835, pp. 219 - 222
DOI: 10.1126/science.1142882
Prev | Table of Contents | Next

Reports

Scattering and Interference in Epitaxial Graphene

G. M. Rutter,1 J. N. Crain,2 N. P. Guisinger,2 T. Li,1 P. N. First,1* J. A. Stroscio2*

A single sheet of carbon, graphene, exhibits unexpected electronic properties that arise from quantum state symmetries, which restrict the scattering of its charge carriers. Understanding the role of defects in the transport properties of graphene is central to realizing future electronics based on carbon. Scanning tunneling spectroscopy was used to measure quasiparticle interference patterns in epitaxial graphene grown on SiC(0001). Energy-resolved maps of the local density of states reveal modulations on two different length scales, reflecting both intravalley and intervalley scattering. Although such scattering in graphene can be suppressed because of the symmetries of the Dirac quasiparticles, we show that, when its source is atomic-scale lattice defects, wave functions of different symmetries can mix.

1 School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USA.
2 Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

* To whom correspondence should be addressed. E-mail: joseph.stroscio{at}nist.gov (J.A.S.); first{at}physics.gatech.edu (P.N.F.)

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Graphene at the Edge: Stability and Dynamics.
C. O. Girit, J. C. Meyer, R. Erni, M. D. Rossell, C. Kisielowski, L. Yang, C.-H. Park, M. F. Crommie, M. L. Cohen, S. G. Louie, et al. (2009)
Science 323, 1705-1708
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)