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Updated: Apr 5, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
Guiding of Electrons in a Few-Mode Ballistic Graphene Channel
Peter Rickhaus1, Ming-Hao Liu2, Péter Makk1
1Department of Physics, University of Basel , Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Abstract:
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.
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