Oz Annabelle, Dutta Debopriya, Nitzan Abraham, Hod Oded, Koren Elad
Department of Physical Chemistry, School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences and The Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv, 6997801, Israel.
Faculty of Materials Science and Engineering and the Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology, Haifa, 3200003, Israel.
Adv Sci (Weinh). 2022 May;9(14):e2102261. doi: 10.1002/advs.202102261. Epub 2022 Mar 13.
Zigzag edges in graphitic systems exhibit localized electronic states that drastically affect their properties. Here, room-temperature charge transport experiments across a single graphitic interface are reported, in which the interlayer current is confined to the contact edges. It is shown that the current exhibits pronounced oscillations of up to ≈40 µA with a dominant period of ≈5 Å with respect to lateral displacement that do not directly correspond to typical graphene lattice spacing. The origin of these features is computationally rationalized as quantum mechanical interference of localized edge states showing significant amplitude and interlayer coupling variations as a function of the interface stacking configuration. Such interference effects may therefore dominate the transport properties of low-dimensional graphitic interfaces.
石墨系统中的锯齿形边缘呈现出局域电子态，这会极大地影响其性质。在此，报道了在单个石墨界面上进行的室温电荷传输实验，其中层间电流被限制在接触边缘。结果表明，电流表现出明显的振荡，相对于横向位移，振荡幅度高达约40 μA，主导周期约为5 Å，这与典型的石墨烯晶格间距并无直接对应关系。这些特征的起源通过计算得到合理解释，即局域边缘态的量子力学干涉，其显示出显著的幅度和层间耦合变化，这是界面堆叠构型的函数。因此，这种干涉效应可能主导低维石墨界面的传输性质。
