Conductance Anisotropy in Epitaxial Graphene Sheets Generated by Substrate Interactions

Abstract

We present the first microscopic transport study of epitaxial graphene on SiC using an ultrahigh vacuum four-probe scanning tunneling microscope. Anisotropic conductivity is observed that is caused by the interaction between the graphene and the underlying substrate. These results can be explained by a model where charge buildup at the step edges leads to local scattering of charge carriers. This highlights the importance of considering substrate effects in proposed devices that utilize nanoscale patterning of graphene on electrically isolated substrates.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2010
Accession Number
ADA536717

Entities

People

  • Arnaldo R. Laracuente
  • Charles. R. Eddy Jr.
  • D. Kurt Gaskill
  • Daniel Gunlycke
  • Joseph L. Tedesco
  • Michael K. Yakes
  • Paul E Sheehan
  • Paul M. Campbell
  • Rachael L. Myers-ward

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Anisotropy
  • Charge Carriers
  • Conductivity
  • Crystal Lattice Vibrations
  • Electron Mobility
  • Films
  • Fullerenes
  • Graphene
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Measurement
  • Military Research
  • Mobility
  • Scattering
  • Silicon Carbide
  • Transport Properties

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene