Spatially resolved edge currents and guided-wave electronic states in graphene View Full Text


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Article Info

DATE

2016-02

AUTHORS

M. T. Allen, O. Shtanko, I. C. Fulga, A. R. Akhmerov, K. Watanabe, T. Taniguchi, P. Jarillo-Herrero, L. S. Levitov, A. Yacoby

ABSTRACT

Exploiting the light-like properties of carriers in graphene could allow extreme non-classical forms of electronic transport to be realized1,2,3,4,5,6,7,8. In this vein, finding ways to confine and direct electronic waves through nanoscale streams and streamlets, unimpeded by the presence of other carriers, has remained a grand challenge9,10,11,12. Inspired by guiding of light in fibre optics, here we demonstrate a route to engineer such a flow of electrons using a technique for mapping currents at submicron scales. We employ real-space imaging of current flow in graphene to provide direct evidence of the confinement of electron waves at the edges of a graphene crystal near charge neutrality. This is achieved by using superconducting interferometry in a graphene Josephson junction and reconstructing the spatial structure of conducting pathways using Fourier methods13. The observed edge currents arise from coherent guided-wave states, confined to the edge by band bending and transmitted as plane waves. As an electronic analogue of photon guiding in optical fibres, the observed states afford non-classical means for information transduction and processing at the nanoscale. More... »

PAGES

128

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nphys3534

DOI

http://dx.doi.org/10.1038/nphys3534

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1001367359


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