Multi-wall carbon nanotubes as quantum dots
摘要
We have measured the differential conductance dI/dV of individual multi-wall carbon nanotubes (MWNT) of different lengths. A cross-over from wire-like (long tubes) to dot-like (short tubes) behavior is observed. dI/dV is dominated by random conductance fluctuations (UCF) in long MWNT devices (L=2...7 ), while Coulomb blockade and energy level quantization are observed in short ones (L=300 nm). The electron levels of short MWNT dots are nearly four-fold degenerate (including spin) and their evolution in magnetic field (Zeeman splitting) agrees with a g-factor of 2. In zero magnetic field the sequential filling of states evolves with spin S according to S=0 -> 1/2 -> 0... In addition, a Kondo enhancement of the conductance is observed when the number of electrons on the tube is odd.
引用
@article{arxiv.cond-mat/0110074,
title = {Multi-wall carbon nanotubes as quantum dots},
author = {M. R. Buitelaar and A. Bachtold and T. Nussbaumer and M. Iqbal and C. Schoenenberger},
journal= {arXiv preprint arXiv:cond-mat/0110074},
year = {2016}
}
备注
10 pages, 4 figures