Quasiparticle Chirality in Epitaxial Graphene Probed at the Nanometer Scale

Details Quasiparticle Chirality in Epitaxial Graphene Probed at the Nanometer Scale Quasiparticle Chirality in Epitaxial Graphene Probed at the Nanometer Scale

2008-06-16

arxiv.org/abs/0806.2616v2

Physical Review Letters 101, 206802 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, minor changes

Scientific paper

10.1103/PhysRevLett.101.206802

Graphene exhibits unconventional two-dimensional electronic properties resulting from the symmetry of its quasiparticles, which leads to the concepts of pseudospin and electronic chirality. Here we report that scanning tunneling microscopy can be used to probe these unique symmetry properties at the nanometer scale. They are reflected in the quantum interference pattern resulting from elastic scattering off impurities, and they can be directly read from its fast Fourier transform. Our data, complemented by theoretical calculations, demonstrate that the pseudospin and the electronic chirality in epitaxial graphene on SiC(0001) correspond to the ones predicted for ideal graphene.

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