Magnetotransport properties of zigzag and armchair graphene nanoribbons that are in contact with superconductors are investigated using a tight-binding model. The cyclotron orbital motion together with the quantum interference under the coexistence of Andreev and normal reflections gives rise to a number of oscillations in characteristic magnetic-field regimes when the superconducting coupling is weak. The oscillations become irregular and/or suppressed as the coupling is made strong. The period of the oscillations differs from that when a nonrelativistic two-dimensional electron gas is employed rather than the graphene sheet. The modifications of the oscillations are attributed to the phase shift associated with the reflection from the graphene–superconductor interface. The presence of a magnetic field suppresses the quantum blocking of Andreev transmission, which occurs for the edge mode of zigzag nanoribbons, in the same way regardless of it being induced by the Andreev retro- or specular reflection.

使用紧束缚模型研究了与超导体接触的锯齿形和扶手椅石墨烯纳米带的磁传输特性。当超导耦合较弱时，回旋加速器轨道运动与安德列夫反射和法向反射共存下的量子干涉会引起特征磁场区域的许多振荡。随着耦合变强，振荡变得不规则和/或被抑制。振荡周期与使用非相对论二维电子气而不是石墨烯片时的周期不同。振荡的改变归因于与石墨烯-超导体界面反射相关的相移。