Transport Spectroscopy of Single-Walled Carbon Nanotubes
David H. Cobden, Marc Bockrath, Nasreen Chopra, Alex Zettl, Paul L. McEuen, Andrew Rinzler, Andreas Thess, Richard E. Smalley
Abstract
We have performed transport spectroscopy on individual ropes of single-walled carbon nanotubes. We find that the levels are Zeeman split in a magnetic field, with a g-factor of 2.04 +- 0.05. The observed pattern of peak splittings indicates the parity of the number of electrons on the dot. In one device there are also signs of the presence of a second dot. We observe features which resemble anticrossings between quantum levels in the two dots, which may be formed from separate conducting nanotubes within the rope.
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