A brief review is given on electronic properties of carbon nanotubes, in particular those in magnetic fields, mainly from a theoretical point of view. The topics include a giant Aharonov-Bohm effect on the band gap and optical absorption spectra, a magnetic-field induced lattice distortion and a magnetization and susceptibility of ensembles, calculated based on a k . p scheme. (C) 1997 Elsevier Science Ltd. References: 28
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