graphene量子点的起伏效应对尺寸的敏感性研究

The investigation of roughing effect sensitive to size in graphene quantum dot device

用第一原理研究了graphene量子点器件在不同尺寸时的输运特性,以得到起伏效应所引起的输运特性的变化,以及对尺寸的敏感性.研究结果表明无论电极与锯齿型边界的graphene量子点相连还是与扶手椅型边界的graphene量子点相连,都会受起伏效应较大的影响,并且随尺寸的不同影响程度也不同.加偏压后得到的电流也受较大影响,但两种连法受到的影响随尺寸的增加效果不同.

The transport property of graphene quantum dot devices of different length is investigated by first-principles calculation.The changes of transport property caused by roughing effect are sensitive to size of graphene.The results demonstrate that whether the electrode is connected with zigzag edge or armchair edge of graphene,both the transmission coefficient and current always change.But the changes have reversed effect for the two different connections when the length is increased.