Abstract
A π-electron network in carbon nanotubes with zigzag open edges exhibits strongly localized edge states, which are expected to show peculiar magnetic properties. We study the effect of the electron–electron interaction on the magnetic properties of the systems using the density-matrix renormalization-group method. We show that effective spins which can move almost freely appear around the zigzag open edges. A schematic picture representing the low-energy physics of nanographite systems with zigzag edges is proposed.
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