Fig. 5: Electron transport in 9-AGNR transistors (D7) with S-SWNT leads.
From: Contacting individual graphene nanoribbons using carbon nanotube electrodes
a, Colour-scaled current versus VSG1 and VSG2 at fixed VBias = 100 mV and VFG = 0 V. The four sketches on the four corners illustrate the band diagrams of four different regimes for the SWNT electrodes (from left to right): p–p, p–gap, gap–p or gap–gap. The four coloured dots mark the positions of (VSG1, VSG2) settings for the measurements in c. b, Evolution of electrical transport (current) as a function of VFG, VSG1 and VSG2 (left). Nine colour-scaled current maps are shown in the three-dimensional plot: map of current versus VSG1 and VSG2 at VFG = 0 V and VBias = 100 mV (also shown in a); maps of current versus VFG and VSG1 at five different VSG2 values of –4, –2, 0, 2 and 4 V, and VBias = 50 mV; maps of current versus VFG and VSG2 at three different VSG1 values of –4, 0 and 4 V, and VBias = 50 mV. Two example maps as edge highlighted by the blue dashed line and yellow dashed line in the left three-dimensional plot (right). Current versus VFG and VSG1 values at VSG2 = –4 V (top right); current versus VFG and VSG2 at VSG1 = –4 V (bottom right). c, Colour-scaled differential conductance versus VFG and VBias for different (VSG1, VSG2) settings as per their position marked by the four coloured dots in a—from left to right: (–1.0 V, –1.0 V), (–0.6 V, 0.6 V), (–0.4 V, 0.4 V) and (1.0 V, 1.0 V). Several resonances with two different slopes are marked with grey or yellow arrows. d, Differential conductance versus VBias cut along VFG = 2.7 V in the four maps shown in c (as marked by the four coloured arrows on top of the maps).
