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Nonuniversal Transverse Electron Mean Free Path through Few-layer Graphene.

D Geelen1, J Jobst1, E E Krasovskii2,3,4

  • 1Huygens-Kamerlingh Onnes Laboratorium, Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, P.O. Box 9504, NL-2300 RA Leiden, Netherlands.

Physical Review Letters
|September 7, 2019
PubMed
Summary
This summary is machine-generated.

Transverse electron scattering in graphene was measured, revealing a mean-free path (MFP) shorter than assumed and dependent on graphene layer number, refuting universal models.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Surface science

Background:

  • The in-plane electron mean-free path (MFP) in graphene is well-studied.
  • The transverse MFP is less understood and often assumed to follow a universal curve.

Purpose of the Study:

  • To directly measure transverse electron scattering in graphene.
  • To determine quantitative elastic and inelastic MFPs.
  • To challenge the assumed universal MFP curve.

Main Methods:

  • Direct measurement of transverse electron scattering using low-energy electron microscopy (LEEM) in reflection.
  • Transmission electron energy loss spectroscopy (TEELS) for transmission measurements.
  • Electron energy range: 0 to 25 eV above the vacuum level.

Main Results:

  • The total transverse MFP is only a few graphene layers, even at low energies.
  • The elastic MFP oscillates with the number of graphene layers.
  • The universal MFP curve is refuted by experimental data.

Conclusions:

  • Graphene's transverse electron transport deviates significantly from universal models.
  • Theoretical calculations incorporating graphene's band structure support the experimental findings.
  • Simple models can reproduce key experimental observations.