Energy Band-Gap Engineering of Graphene Nanoribbons

Melinda Y. Han, Barbaros Özyilmaz, Yuanbo Zhang, and Philip Kim
Phys. Rev. Lett. 98, 206805 – Published 16 May 2007

Abstract

We investigate electronic transport in lithographically patterned graphene ribbon structures where the lateral confinement of charge carriers creates an energy gap near the charge neutrality point. Individual graphene layers are contacted with metal electrodes and patterned into ribbons of varying widths and different crystallographic orientations. The temperature dependent conductance measurements show larger energy gaps opening for narrower ribbons. The sizes of these energy gaps are investigated by measuring the conductance in the nonlinear response regime at low temperatures. We find that the energy gap scales inversely with the ribbon width, thus demonstrating the ability to engineer the band gap of graphene nanostructures by lithographic processes.

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  • Received 21 February 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.206805

©2007 American Physical Society

Authors & Affiliations

Melinda Y. Han1, Barbaros Özyilmaz2, Yuanbo Zhang2, and Philip Kim2

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
  • 2Department of Physics, Columbia University, New York, New York 10027, USA

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Issue

Vol. 98, Iss. 20 — 18 May 2007

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