Guiding of Electrons in a Few-Mode Ballistic Graphene Channel.
In graphene, the extremely fast charge carriers can be controlled by electron-optical elements, such as waveguides, in which the transmissivity is tuned by the wavelength. In this work, charge carriers are guided in a suspended ballistic few-mode graphene channel, defined by electrostatic gating. By depleting the channel, a reduction of mode number and steps in the conductance are observed, until the channel is completely emptied. The measurements are supported by tight-binding transport calculations including the full electrostatics of the sample.
Department of Physics, University of Basel , Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Peter
P
Rickhaus
Institut für Theoretische Physik, Universität Regensburg , D-93040 Regensburg, Germany.
Ming-Hao
MH
Liu
Department of Physics, University of Basel , Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Péter
P
Makk
Department of Physics, University of Basel , Klingelbergstrasse 82, CH-4056 Basel, Switzerland.|University Grenoble Alpes, CEA-INAC-SPSMS , F-38000 Grenoble, France.
Romain
R
Maurand
Department of Physics, University of Basel , Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Samuel
S
Hess
Department of Physics, University of Basel , Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Simon
S
Zihlmann
Department of Physics, University of Basel , Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Markus
M
Weiss
Institut für Theoretische Physik, Universität Regensburg , D-93040 Regensburg, Germany.
Klaus
K
Richter
Department of Physics, University of Basel , Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Christian
C
Schönenberger
1D confinement; Suspended graphene; ballistic transport; electron guiding; electron-optics; p−n junction