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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Published on: July 24, 2015

Quantum tunneling through graphene nanorings.

Zhenhua Wu1, Z Z Zhang, Kai Chang

  • 1SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, 100083 Beijing, People's Republic of China.

Nanotechnology
|April 15, 2010
PubMed
Summary

Graphene nanorings exhibit resonant tunneling behavior, unlike conventional semiconductor rings. This quantum transport can be controlled by Fermi energy, nanoring size, and magnetic fields.

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Area of Science:

  • Quantum Physics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Graphene nanorings are novel structures with unique electronic properties.
  • Understanding quantum transport in these systems is crucial for future electronics.
  • Conventional semiconductor rings typically show Aharonov-Bohm oscillations.

Purpose of the Study:

  • To theoretically investigate quantum transport in graphene nanorings.
  • To explore the influence of a perpendicular magnetic field on transport properties.
  • To compare the behavior of graphene nanorings with conventional semiconductor rings.

Main Methods:

  • Theoretical modeling of quantum transport.
  • Analysis of electron behavior in graphene nanorings under magnetic fields.
  • Simulation of resonant tunneling phenomena.

Main Results:

  • Graphene nanorings function as resonant tunneling devices.
  • Observed behavior contrasts with Aharonov-Bohm oscillations in semiconductor rings.
  • Resonant tunneling is tunable via Fermi energy, nanoring size, and magnetic field strength.

Conclusions:

  • Graphene nanorings offer a distinct quantum transport mechanism.
  • The tunable resonant tunneling in graphene nanorings presents opportunities for novel electronic devices.
  • Further research into graphene-based quantum devices is warranted.