Logic circuits with carbon nanotubes

A new technique is used for achieving field‐effect transistors based on a single semiconducting nanotube and with a gate that is local and that provides an excellent capacitive coupling with the nanotube. Transconductance measurements are reported that show the possible injection of either p‐ and n‐type carriers. Importantly, we demonstrate circuits that exhibit digital logic operations such as an inverter and an ac ring oscillator.