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Related Experiment Video

Updated: May 26, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Transport through graphene on SrTiO3.

Nuno J G Couto1, Benjamin Sacépé, Alberto F Morpurgo

  • 1Départment de Physique de la Matiére Condensée (DPMC) and Group of Applied Physics (GAP), University of Geneva, 24 Quai Ernest-Ansermet, 1211 Genéve 4, Switzerland.

Physical Review Letters
|December 21, 2011
PubMed
Summary

Graphene

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Graphene exhibits unique electronic properties due to its Dirac electrons.
  • Strontium titanate (SrTiO3) possesses a high dielectric constant.
  • Substrate effects can significantly influence the electronic behavior of 2D materials.

Purpose of the Study:

  • To investigate the impact of SrTiO3 substrates on graphene's electronic transport properties.
  • To understand how substrate screening affects electron-electron interactions in graphene.
  • To explore the behavior of Dirac electrons under varying conditions.

Main Methods:

  • Transport measurements were conducted on graphene samples grown on SrTiO3 substrates.
  • Measurements were performed as a function of magnetic field (B), carrier density (n), and temperature (T).
  • Analysis focused on longitudinal resistance and transport gap characteristics.

Main Results:

  • The high dielectric constant of SrTiO3 effectively screens interactions, rendering graphene's Dirac electrons nearly noninteracting.
  • An unexpected longitudinal resistance behavior was observed in the N=0 Landau level.
  • A significant suppression of the transport gap was found in graphene nanoribbons.
  • Bulk transport properties at zero magnetic field remained unaffected by the substrate.

Conclusions:

  • Substrate-induced screening dramatically alters the interaction landscape of Dirac electrons in graphene.
  • The observed phenomena highlight the importance of dielectric environments in tuning quantum electronic properties.
  • Graphene nanoribbons show pronounced sensitivity to substrate screening effects.

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