Coulomb Blockade and Hopping Conduction in Graphene Quantum Dots Array

Details Coulomb Blockade and Hopping Conduction in Graphene Quantum Dots Array Coulomb Blockade and Hopping Conduction in Graphene Quantum Dots Array

2010-10-26

arxiv.org/abs/1010.5306v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

The document will be appeared in Physics Review B

Scientific paper

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.

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