Abstract
Conductance due to inter-tube transfer in incommensurate double-wall tubes is numerically studied. The conductance is usually much smaller than e 2 / π ℏ and its average and fluctuation are independent of the length. This behavior arises because the inter-tube transfer oscillate around zero in a complex plain as a function of position in a quasi-periodic manner and therefore cancel each other when being summed up except near tube edges.
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