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Fig. 19.29. Plot of the energy bands E(k) for the ID tubule for values of the energy, in dimensionless units E(k)/y0, for the case of the metallic carbon nanotube specified by integers (n, m) = (9,6) for which the largest common divisor is d = 3, and the Fermi level is at EF = 0. The general behavior of the four energy bands intersecting at k = 0 is typical of the case where ti — m / 3rd, and r is an integer [19.101],

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