Point-contact conductance in asymmetric Chalker-Coddington network model

Koji Kobayashi, Tomi Ohtsuki, Keith Slevin

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We study the transport properties of disordered two-dimensional electron systems with a perfectly conducting channel. We introduce an asymmetric Chalker-Coddington network model and numerically investigate the point-contact conductance. We find that the behavior of the conductance in this model is completely different from that in the symmetric model. Even in the limit of a large distance between the contacts, we find a broad distribution of conductance and a non-trivial power law dependence of the averaged conductance on the system width. Our results are applicable to systems such as zigzag graphene nano-ribbons where the numbers of left-and right-going channels are different.

Original languageEnglish
Article number084708
Journaljournal of the physical society of japan
Volume78
Issue number8
DOIs
Publication statusPublished - 2009 Aug
Externally publishedYes

Keywords

  • Chalker-Coddington model
  • Graphene
  • Network model
  • Perfectly conducting channel
  • Point-contact conductance

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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