物质非平衡合成与调控教育部重点实验室
所在位置:研究进展
 研究进展
New result of Professor Dai Hongjie
发布时间:2011-10-13 12:01:00

Nature Nanotechnology, Volume:  6,  Pages:  563–567
Year published:  (2011)

Graphene nanoribbons with smooth edges behave as quantum wires

Xinran Wang,Yijian Ouyang, Liying Jiao,Hailiang Wang,Liming Xie, Justin Wu,  Jing Guo & Hongjie Dai

Graphene nanoribbons with perfect edges are predicted to exhibit interesting electronic and spintronic properties1, 2, 3, 4, notably quantum-confined bandgaps and magnetic edge states. However, so far, graphene nanoribbons produced by lithography have had rough edges, as well as low-temperature transport characteristics dominated by defects (mainly variable range hopping between localized states in a transport gap near the Dirac point5, 6, 7, 8, 9). Here, we report that one- and two-layer nanoribbon quantum dots made by unzipping carbon nanotubes10 exhibit well-defined quantum transport phenomena, including Coulomb blockade, the Kondo effect, clear excited states up to ~20 meV, and inelastic co-tunnelling. Together with the signatures of intrinsic quantum-confined bandgaps and high conductivities, our data indicate that the nanoribbons behave as clean quantum wires at low temperatures, and are not dominated by defects.




物质非平衡合成与调控教育部重点实验室