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In the original publication, an error was made on an axis label in figure 4 during final submission. The units of the independent variable L were quoted as nanometers (nm) on the axis label, even though the quantity should be dimensionless, being the number of unit cells in the carbon nanotube models considered in the figure. A figure with a corrected axis label is provided here.
Figure 1. Ground-state HOMO-LUMO energy gaps and 
values from TDDFT for defect-free (6, 6) CNTs as a function of the number of unit cells, L. Based on our optimized geometries, there are about (17/4) unit cells per nm. Using this conversion, the CNT circumference has the same length as L=11, indicated as the vertical line. As the length of the finite segments is decreased and the excited carriers are confined in a smaller space, the energy of the first absorption peak in the defect-free (6, 6) increases. This tracks with the increase in HOMO-LUMO gap as L is decreased, and with its decay as L gets larger.
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