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Boundary scattering in ballistic graphene.

Satoru Masubuchi1, Kazuyuki Iguchi, Takehiro Yamaguchi

  • 1Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan. msatoru@iis.u-tokyo.ac.jp

Physical Review Letters
|August 7, 2012
PubMed
Summary

We studied magnetotransport in graphene wires, finding unique peak structures in magnetoresistance. This behavior, linked to diffusive boundary scattering, differs from classical systems.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Ballistic graphene mesoscopic wires exhibit unique quantum phenomena.
  • Understanding charge carrier behavior in confined geometries is crucial for electronic device development.

Purpose of the Study:

  • To investigate magnetotransport properties in ballistic graphene mesoscopic wires.
  • To analyze the influence of diffusive boundary scattering on magnetoresistance peaks.

Main Methods:

  • Magnetotransport measurements were performed on graphene mesoscopic wires.
  • The charge carrier mean free path was comparable to the wire width (W).

Main Results:

  • Characteristic peak structures were observed in magnetoresistance curves.
  • The peak field scaling followed W/R(c)=0.9±0.1, indicating diffusive boundary scattering.
  • This scaling differs from classical semiconductor two-dimensional electron systems (W/R(c)=0.55).

Conclusions:

  • Diffusive boundary scattering significantly impacts magnetotransport in graphene mesoscopic wires.
  • Graphene's unique electronic properties lead to distinct magnetoresistance behaviors compared to traditional materials.