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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Single-parameter charge pump in a zigzag graphene nanoribbon.

Y Gu1, Y H Yang, J Wang

  • 1Department of Physics, Southeast University, Nanjing 210096, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 12, 2011
PubMed
Summary

A quantum charge pump in zigzag graphene nanoribbons (ZGNRs) shows a sharp current increase when frequency matches Fermi energy for even-numbered chains. Odd-numbered ZGNRs and armchair graphene nanoribbons exhibit no pumped current due to unique edge states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Transport

Background:

  • Quantum charge pumps are crucial for nanoscale electronic devices.
  • Graphene nanoribbons (GNRs) exhibit unique electronic properties based on their edge structure (zigzag or armchair).
  • Understanding edge states in GNRs is key to controlling quantum transport.

Purpose of the Study:

  • To theoretically investigate a single-parameter quantum charge pump in clean zigzag graphene nanoribbons (ZGNRs).
  • To analyze the influence of ZGNR edge structure and Fermi energy on pumped current.
  • To explore the potential of ZGNRs for novel quantum pumping applications.

Main Methods:

  • Utilized the Keldysh Green's function method for theoretical analysis.
  • Modeled a single-parameter quantum charge pump system.
  • Investigated systems with varying numbers of zigzag chains and edge types (zigzag vs. armchair).

Main Results:

  • A sharp increase in pumped current was observed in even-numbered ZGNRs when pumping frequency matched the Fermi energy.
  • Pumped charge current was consistently absent in odd-numbered ZGNRs and armchair GNRs.
  • The presence of zero-energy edge states and symmetry breaking in ZGNRs explains the observed current behavior.
  • Pumped current in even-ZGNRs depends on Fermi energy relative to the Dirac point and edge atom type.

Conclusions:

  • The electronic properties of ZGNRs, particularly edge states, significantly impact quantum charge pumping.
  • Even-numbered ZGNRs offer a promising platform for tunable quantum charge pumping.
  • Odd-numbered ZGNRs and armchair GNRs do not support quantum charge pumping under these conditions.
  • Two-parameter pumping in ZGNRs can achieve comparable current magnitudes to single-parameter pumping at resonant frequencies.