Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-07-19
Phys. Rev. B 77, 035316 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Extended version accepted for publication at Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.035316
We analyze charging effects in graphene quantum dots. Using a simple model, we show that, when the Fermi level is far from the neutrality point, charging effects lead to a shift in the electrostatic potential and the dot shows standard Coulomb blockade features. Near the neutrality point, surface states are partially occupied and the Coulomb interaction leads to a strongly correlated ground state which can be approximated by either a Wigner crystal or a Laughlin like wave function. The existence of strong correlations modify the transport properties which show non equilibrium effects, similar to those predicted for tunneling into other strongly correlated systems.
Guinea Francisco
Stauber Tobias
Wunsch Bernhard
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