Graphene, an ideal material for spintronics?

Crossover from Coulomb Blockade to Quantum Hall Effect in Suspended Graphene Nanoribbons

“…We then find that the carrier density scales linearly with gate voltage, as it should. The slope α = ∆n/∆V g = 7.8 × 10 9 cm −2 V −1 is slightly larger than the value, 4.7 ×10 9 cm −2 V −1 , estimated from the formula for a parallel plate capacitor, as expected, since the ribbon width [19] is smaller than the distance to the gate (the value of α agrees quantitatively with a recent study of suspended graphene in the quantum Hall regime [20], where an enhanced capacitance at the edges was found). By extrapolating to B = 0 T, we find that charge neutrality occurs at V g = V CN P = 8.5 V (see Fig.…”