Observation of Wigner cusps in a metallic carbon nanotube

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.

Automated summary

Previous conductivity measurements on metallic carbon nanotubes have observed unexplainable conductance suppressions, which were previously attributed to the gate dependency of contact resistance. However, new research shows that these phenomena are actually manifestations of Wigner cusps.