title: Fingerprints of Multiple Electron Scatterings in Single-Layer Graphene.
abstract: The electrons in graphene exhibit unusual behaviours, which can be described by massless Dirac quasiparticles. Understanding electron scattering in graphene has been of significant importance for its future application in electronic devices because electron scattering determines electrical properties such as resistivity and electron transport. There are two types of electron scatterings in graphene: intervalley scattering and intravalley scattering. In single-layer graphene, to date, it has been difficult to observe intravalley scattering because of the suppression of backscattering resulting from the chiral nature of the electrons in graphene. Here, we report the multiple electron scattering behaviours in single-layer graphene on a metallic substrate. By applying one- and two-dimensional Fourier transforms to maps of the local density of states, we can distinguish individual scattering processes from complex interference patterns. These techniques enable us to provide direct evidence of intravalley scattering, revealing a linear dispersion relation with a Fermi velocity of ~7.4 × 10(5) m/s.
authors.affiliation: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea.|Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS) Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS), UNIST-gil 50, Ulsan 44919, Republic of Korea.
authors.forename: Minbok
authors.initials: M
authors.lastname: Jung
authors.affiliation: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea.
authors.forename: So-Dam
authors.initials: SD
authors.lastname: Sohn
authors.affiliation: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea.
authors.forename: Jonghyun
authors.initials: J
authors.lastname: Park
authors.affiliation: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea.|KIST-UNIST Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea.
authors.forename: Keun-U
authors.initials: KU
authors.lastname: Lee
authors.affiliation: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea.|Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS) Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS), UNIST-gil 50, Ulsan 44919, Republic of Korea.|KIST-UNIST Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea.
authors.forename: Hyung-Joon
authors.initials: HJ
authors.lastname: Shin