Coulomb blockade in graphene quantum dots
Qiong Ma, Tao Tu, Zhi-Rong Lin, Guang-Can Guo, Guo-Ping Guo
Abstract
We study the conductance spectrum of graphene quantum dots, both single and multiple cases. The single electron tunneling phenomenon is investigated and the periodicity, amplitude and line shape of the Coulomb blockade oscillations at low temperatures are obtained. Further, we discuss the transport behavior when multiple dots are assembled in array and find a phase transition of conductance spectra from individual Coulomb blockade to collective Coulomb blockade.