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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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One-Step Theory View on Photoelectron Diffraction: Application to Graphene.

Eugene Krasovskii1,2,3

  • 1Departamento de Polímeros y Materiales Avanzados, Física, Química y Tecnología, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, 20080 Donostia/San Sebastián, Basque Country, Spain.

Nanomaterials (Basel, Switzerland)
|November 26, 2022
PubMed
Summary

Photoelectron diffraction from graphene reveals structural information comparable to low-energy electron diffraction (LEED). This technique effectively probes graphene

Keywords:
angle-resolved photoemissionaugmented plane waveselectron scatteringgraphene

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Area of Science:

  • Surface science
  • Condensed matter physics
  • Materials science

Background:

  • Determining the atomic structure of materials like graphene is crucial for understanding their properties.
  • Photoelectron diffraction and low-energy electron diffraction (LEED) are surface-sensitive techniques used for structure determination.

Purpose of the Study:

  • To investigate the diffraction of photoelectrons emitted from core and valence bands of monolayer and bilayer graphene.
  • To compare photoelectron diffraction patterns with simulated LEED patterns for structural analysis.

Main Methods:

  • Utilizing the one-step theory of photoemission to model photoelectron diffraction.
  • Comparing energy-dependent angular distributions of photoelectrons with simulated LEED patterns up to 55 eV.
  • Analyzing scattering resonances and the effect of subsurface layers in bilayer graphene.

Main Results:

  • Photoelectron diffraction patterns exhibit constant energy contours due to scattering resonances, which are well-reproduced experimentally.
  • The scattering effect of the subsurface layer in bilayer graphene was successfully identified.
  • Both photoelectron diffraction and LEED patterns provide similar information regarding long-range order.

Conclusions:

  • Photoelectron diffraction is a viable technique for graphene structure determination, offering information comparable to LEED.
  • Diffraction patterns from C 1s and valence band photoelectrons show similar anisotropy and are suitable for analysis.