Point-Contact Conductance in Asymmetric Chalker-Coddington Network Model

Details Point-Contact Conductance in Asymmetric Chalker-Coddington Network Model Point-Contact Conductance in Asymmetric Chalker-Coddington Network Model

2009-04-17

arxiv.org/abs/0904.2651v3

J. Phys. Soc. Jpn. 78 (2009) 084708

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 11 figures, final version

Scientific paper

10.1143/JPSJ.78.084708

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-going and right-going channels are different.

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