Fabrication of a graphene quantum dot device*

Graphene, which exhibits a massless Dirac-like spectrum for its electrons [1], has shown impressive properties for nano-electronics applications including a high mobility and a width dependent bandgap [2]. We will report the preliminary report on the transport property of the suspended graphene nano-ribbon(GNR) quantum dot device down to dilution refrigerator temperature. This GNR QD device was fabricated to realize an ideal probe to investigate Kondo physics---a characteristic phenomenon in the physics of strongly correlated electrons. \\[4pt] [1] K. S. Novoselov, \textit{et al.} Nature 438, 197-200 (2005)\\[0pt] [2] Young-Woo Son, \textit{et al.} Nature 444, 347-349 (2006)