Abstract

Conductance of carbon nanotubes (CNs) with a pair of impurities having a huge and short-range potential is studied within a tight-binding model. When a pair occupies different sublattices, the conductance is given by 2 e 2/πℏ same as in ideal CNs for a small distance and approaches either e 2/πℏ or 0 with the increase of the distance depending on types of their sites. When a pair occupies same sublattice points, the conductance is either e 2/πℏ or 0 independent of the distance.

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