Visualisation of edge effects in side-gated graphene nanodevices
Artikel i vetenskaplig tidskrift, 2014

Using local scanning electrical techniques we study edge effects in side-gated Hall bar nanodevices made of epitaxial graphene. We demonstrate that lithographically defined edges of the graphene channel exhibit hole conduction within the narrow band of similar to 60-125 nm width, whereas the bulk of the material is electron doped. The effect is the most pronounced when the influence of atmospheric contamination is minimal. We also show that the electronic properties at the edges can be precisely tuned from hole to electron conduction by using moderate strength electrical fields created by side-gates. However, the central part of the channel remains relatively unaffected by the side-gates and retains the bulk properties of graphene.

Författare

V. Panchal

Royal Holloway University of London

National Physical Laboratory (NPL)

Arseniy Lartsev

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

A. Manzin

Istituto Nazionale di Ricerca Metrologica

R. Yakimova

Linköpings universitet

A.Y. Tzalenchuk

Royal Holloway University of London

National Physical Laboratory (NPL)

O. Kazakova

National Physical Laboratory (NPL)

Scientific Reports

2045-2322 (ISSN)

Vol. 4 5881

Ämneskategorier

Subatomär fysik

Nanoteknik

DOI

10.1038/srep05881