This is a new nanoscale device that can detect RF. You put in a bias current between D and S, it goes through the graphene (sheet of 1 atom thick carbon). The graphene sheet resonates mechanically at an RF frequency (33 MHz in the reported device) when a signal is coupled in capacitively from the gate. The vibration induces a signal on top of the D-S current. The device works at 77 K (liquid nitrogen temperature), but hopefully can be developed for room temperature operation.