Coulomb Blockade and Hopping Conduction in Graphene Quantum Dots Array
arXiv:1010.5306 · doi:10.1103/PhysRevB.83.115323
Abstract
We show that the low temperature electron transport properties of chemically functionalized graphene can be explained as sequential tunneling of charges through a two dimensional array of graphene quantum dots (GQD). Below 15 K, a total suppression of current due to Coulomb blockade through GQD array was observed. Temperature dependent current-gate voltage characteristics show Coulomb oscillations with energy scales of 6.2-10 meV corresponding to GQD sizes of 5-8 nm while resistance data exhibit an Efros-Shklovskii variable range hopping arising from structural and size induced disorder.
The document will be appeared in Physics Review B