Full text loading...
(a) Schematic diagram of the nanotube SET device. The nanotube bends at the edges of the gate electrode to create two tunnel barriers (black) a distance apart. The central island (red) in between the tunnel barriers above the aluminum oxide, is the defined quantum dot. The gate defines the quantum dot and controls its operation.
Device A: (a) tapping mode atomic force micrograph with wide Al local gate (LG) and Pd source (S) and drain (D) top contacts (scale bar is ). (b) curves at two different gate voltages at , showing CB and single electron tunneling. (c) Current vs local gate voltage showing several reproducible peaks for several temperatures (bottom to top: 4.2, 12, 20, 35, 50, 75, 100, and ). Peaks begin to wash out around , for which .
Differential conductance as a function of local gate voltage and source drain voltage at for two devices: (a) device A and (b) device B. Coulomb diamonds are outlined by the white dotted lines for a guide to the eye. The measured charging energy from the diamond height is and energy level spacings are indicated by arrows in both diagrams.
Article metrics loading...