Journal
NANO LETTERS
Volume 15, Issue 9, Pages 5819-5825Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01877
Keywords
Suspended graphene; ballistic transport; electron guiding; electron-optics; p-n junction; 1D confinement
Categories
Funding
- Deutsche Forschungsgemeinschaft [SFB 689]
- Swiss National Science Foundation
- Swiss Nanoscience Institute
- Swiss NCCR QSIT
- ESF programme Eurographene
- EU FP7 project SE2ND
- ERC Advanced Investigator Grant QUEST
- EU
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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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