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Topological phases in graphitic cones

Lammert1, Crespi

  • 1Department of Physics and Center for Materials Physics, The Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania 16802-6300, USA.

Physical Review Letters
|December 2, 2000
PubMed
Summary
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Graphitic cones with pentagonal disclinations lack Aharonov-Bohm oscillations due to unique electronic structures near the apex. This topological feature causes local metallization in the graphitic material.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphitic cones possess unique electronic properties influenced by topological defects.
  • Apical disclinations, specifically pentagonal ones, introduce significant structural and electronic variations.

Purpose of the Study:

  • To investigate the electronic structure of graphitic cones with apical disclinations.
  • To analyze the impact of topological defects on magnetoconductance oscillations.
  • To understand the local density of states near the cone apex.

Main Methods:

  • Fabrication of graphitic cone rings with single pentagonal disclinations.
  • Measurement of Aharonov-Bohm magnetoconductance oscillations.
  • Theoretical analysis of the local density of states.

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Main Results:

  • Aharonov-Bohm oscillations are absent in graphitic cone rings with a single pentagonal disclination.
  • The local density of states near the apex exhibits qualitative changes.
  • These changes include a cusp dropping to zero at the Fermi energy or a region of nonzero density, indicating local metallization.

Conclusions:

  • The topological features of apical disclinations in graphitic cones fundamentally alter their electronic behavior.
  • The absence of Aharonov-Bohm oscillations is a direct consequence of these topological defects.
  • Local metallization near the apex is a key characteristic of these modified graphitic structures.