Impurity scattering and size quantization effects in a single graphene nanoflake
Artikel i vetenskaplig tidskrift, 2017

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.

state

transport

Physics

films

fabrication

epitaxial graphene

nanoribbons

ag(111)

electronic-properties

Författare

J. Tesch

Universität Konstanz

P. Leicht

Universität Konstanz

F. Blumenschein

Universität Konstanz

L. Gragnaniello

Universität Konstanz

Anders Bergvall

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Tomas Löfwander

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

M. Fonin

Universität Konstanz

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 95 075429

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Nanoteknik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.95.075429