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@ARTICLE{Terrs:828685,
author = {Terrés, B. and Chizhova, L. A. and Libisch, F. and Peiro,
J. and Jörger, D. and Engels, S. and Girschik, A. and
Watanabe, K. and Taniguchi, T. and Rotkin, S. V. and
Burgdörfer, J. and Stampfer, Christoph},
title = {{S}ize quantization of {D}irac fermions in graphene
constrictions},
journal = {Nature Communications},
volume = {7},
issn = {2041-1723},
address = {London},
publisher = {Nature Publishing Group},
reportid = {FZJ-2017-02577},
pages = {11528 -},
year = {2016},
abstract = {Quantum point contacts are cornerstones of mesoscopic
physics and central building blocks for quantum electronics.
Although the Fermi wavelength in high-quality bulk graphene
can be tuned up to hundreds of nanometres, the observation
of quantum confinement of Dirac electrons in nanostructured
graphene has proven surprisingly challenging. Here we show
ballistic transport and quantized conductance of
size-confined Dirac fermions in lithographically defined
graphene constrictions. At high carrier densities, the
observed conductance agrees excellently with the Landauer
theory of ballistic transport without any adjustable
parameter. Experimental data and simulations for the
evolution of the conductance with magnetic field
unambiguously confirm the identification of size
quantization in the constriction. Close to the charge
neutrality point, bias voltage spectroscopy reveals a
renormalized Fermi velocity of ∼1.5 × 106 m s−1 in
our constrictions. Moreover, at low carrier density
transport measurements allow probing the density of
localized states at edges, thus offering a unique handle on
edge physics in graphene devices.},
cin = {PGI-9 / JARA-FIT},
ddc = {500},
cid = {I:(DE-Juel1)PGI-9-20110106 / $I:(DE-82)080009_20140620$},
pnm = {521 - Controlling Electron Charge-Based Phenomena
(POF3-521)},
pid = {G:(DE-HGF)POF3-521},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000376198500001},
pubmed = {pmid:27198961},
doi = {10.1038/ncomms11528},
url = {https://juser.fz-juelich.de/record/828685},
}