Previous gate-dependent conductance measurements of metallic carbon nanotubes have revealed unexplainable conductance suppressions, occurring at two different gate voltages. These were previously attributed to the gate-dependency of contact resistance. Our gate-dependent conductivity measurements on a metallic nanotube with known chirality show that these bimodal conductance suppressions are the manifestations of Wigner cusps, often seen in atomic and nuclear physics experiments.
@article{arxiv.2303.17687,
title = {Observation of Wigner cusps in a metallic carbon nanotube},
author = {B. T. Blue and R. Tsuchikawa and A. Ahmadi and Z. Zhang and D. Heligman and S. D. Lough and J. Hone and E. R. Mucciolo and M. Ishigami},
journal= {arXiv preprint arXiv:2303.17687},
year = {2023}
}