Guiding of Electrons in a Few-Mode Ballistic Graphene Channel

Peter Rickhaus (1) , Ming-Hao Liu (2) , Peter Makk (1) , Romain Maurand (3, 1, 4) , Samuel Hess (1) , Simon Zihlmann (1) , Markus Weiss (1) , Klaus Richter (2) , Christian Schoenenberger (1)

1 Unibas - University of Basel
2 Fakultät für Physik [Regensburg]
3 LaTEQS - Laboratoire de Transport Electronique Quantique et Supraconductivité
4 PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS

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.

Keywords: Suspended graphene; Ballistic Transport; Electron Guiding; Electron-Optics; p-n junction; 1D confinement; Bilayer Graphene

Domains: Physics [physics]

Peter Rickhaus, Ming-Hao Liu, Peter Makk, Romain Maurand, Samuel Hess, et al.. Guiding of Electrons in a Few-Mode Ballistic Graphene Channel. Nano Letters, 2015, 15 (9), pp.5819-5825. ⟨10.1021/acs.nanolett.5b01877⟩. ⟨cea-01735139⟩