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We have calculated the quantum conductance of N-fold helical metallic nanowires by using recursion-transfer-matrix method. When LH (the pitch of the helix) is in a certain range, there appear characteristic humps and dips with steps of 1G₀ or 2G₀ (G₀=2e²/h) in the conductance. The anomalous conductance originates from the fact that an energy gap opens due to noncircular cross section and shifts toward higher energies with decreasing LH.
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Okamoto et al. (2001) studied this question.
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