Spin splitting and even-odd effects in carbon nanotubes

David H. Cobden, Marc Bockrath, Paul L. McEuen, Andrew G. Rinzler, Richard E. Smalley

Published 1998-04-15Version 1

The level spectrum of a single-walled carbon nanotube rope, studied by transport spectroscopy, shows Zeeman splitting in a magnetic field parallel to the tube axis. The pattern of splittings implies that the spin of the ground state alternates by 1/2 as consecutive electrons are added. Other aspects of the Coulomb blockade characteristics, including the current-voltage traces and peak heights, also show corresponding even-odd effects.