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Publication Citation: Scattering and Interference in Epitaxial Graphene

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Author(s): Gregory M. Rutter; Jason Crain; T Li; P First; Joseph A. Stroscio;
Title: Scattering and Interference in Epitaxial Graphene
Published: July 13, 2007
Abstract: 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.
Citation: Science
Volume: 317
Issue: 5835
Pages: pp. 219 - 222
Keywords: electron dispersion;graphene;graphite;interference;scanning tunneling microscope;scattering
Research Areas: Scanning tunneling microscopy (STM)
PDF version: PDF Document Click here to retrieve PDF version of paper (2MB)