Figure 5.

Schematic illustration of effective decoupling at k=±π in zigzag nanoribbons. Since the hopping integral along the zigzag lines are given by −te±ik/2, the nanoribbons are effectively disconnected as indicated by shaded regions in the right side of figure.

Harigaya and Kaneko Nanoscale Research Letters 2013 8:341   doi:10.1186/1556-276X-8-341
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