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We study interband dipole transitions across curvature-induced narrow gaps in quasi-metallic single-walled carbon nanotubes. The curvature effects not only open a gap in the nanotube energy spectrum but also allow optical transitions, which happen to be in the highlydesired terahertz frequency range. Applying a magnetic field along the nanotube axis allows one to tune the frequency peaks in the spectral density of absorption.doi:10.1088/1757-899x/79/1/012014 fatcat:67aa3vaahbbuxjjsvjs4ome6u4