demonstrations.wolfram.com The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. This Demonstration shows the dependence of the value of the optical matrix element D_z for light polarized parallel to the nanotube axis over the Brillouin zone (BZ) of a single-walled carbon nanotube (SWNT). A general analytical expression for D_z for ... Contributed by: Jessica Alfonsi (University of Padova, Italy)