Carbon nanotubes: Optical absorption in aharonov-bohm flux

Abstract

Optical absorption spectra for carbon nanotubes are calculated in the presence of an Aharonov-Bohm flux passing through the cross section. The band gap drastically changes with a period of the magnetic flux quantum because of the Aharonov-Bohm effect. The effect can be seen as a shift of the absorption peaks for light polarization parallel to the tube axis. For perpendicular polarization the absorption is strongly suppressed due to a depolarization effect. © 1995 The Japan Society of Applied Physics.