International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan.
Nanoscale. 2012 Feb 21;4(4):1138-45. doi: 10.1039/c1nr11056j. Epub 2011 Nov 14.
We have numerically investigated the magnetic response of the conductance peak structures in the transport gap of graphene nanoribbons. It is shown that the magnetic field induces a number of new conductance peaks within the transport gap of graphene nanoribbons confined by structural junctions. In addition, the magnetic field causes a shift of the conductance peak position and broadening of the peak width. This behaviour is due to the disappearance of zero conductance dips at the junction as a result of breaking time-reversal symmetry. Such behaviour is, however, not observed in the electronic transport of graphene nanoribbons confined by potential barriers, i.e. p-n-junctions. Thus, the magnetic response of conductance peaks may be used to distinguish the origin of the conductance peak structure within the transport gap observed in the experiments.
我们对结构结限制的石墨烯纳米带输运带隙中的电导峰结构的磁响应进行了数值研究。结果表明，磁场在结构结限制的石墨烯纳米带的输运带隙内诱导了多个新的电导峰。此外，磁场会导致电导峰位置的移动和峰宽的展宽。这种行为是由于在时间反演对称被破坏的情况下，结处的零电导谷消失所致。然而，这种行为在由势垒限制的石墨烯纳米带的电子输运中，即 p-n 结中并没有观察到。因此，电导峰的磁响应可以用来区分实验中观察到的输运带隙中电导峰结构的起源。
