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Impurity scattering and size quantization effects in a single graphene nanoflake

J. Tesch ; P. Leicht ; F. Blumenschein ; L. Gragnaniello ; Anders Bergvall (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Tomas Löfwander (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; M. Fonin
Physical Review B: covering condensed matter and materials physics (2469-9950). Vol. 95 (2017), 7,
[Artikel, refereegranskad vetenskaplig]

By using Fourier-transform scanning tunneling spectroscopy we measure the interference patterns produced by the impurity scattering of confined Dirac quasiparticles in epitaxial graphene nanoflakes. Upon comparison of the experimental results with tight-binding calculations of realistic model flakes, we show that the characteristic features observed in the Fourier-transformed local density of states are related to scattering between different transverse modes (subbands) of a graphene nanoflake and allow direct insight into the gapped electronic spectrum of graphene. We also observe a strong reduction of quasiparticle lifetime which is attributed to the interaction with the underlying substrate. In addition, we show that the distribution of the on-site energies at flower defects leads to an effectively broken pseudospin selection rule, where intravalley backscattering is allowed.

Nyckelord: epitaxial graphene, electronic-properties, nanoribbons, fabrication, transport, ag(111), state, films, Physics

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Denna post skapades 2017-03-31. Senast ändrad 2017-07-07.
CPL Pubid: 248749


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