Morozov S V, Novoselov K S, Katsnelson M I, Schedin F, Ponomarenko L A, Jiang D, Geim A K
Department of Physics, University of Manchester, Manchester M13 9PL, United Kingdom.
Phys Rev Lett. 2006 Jul 7;97(1):016801. doi: 10.1103/PhysRevLett.97.016801. Epub 2006 Jul 5.
Low-field magnetoresistance is ubiquitous in low-dimensional metallic systems with high resistivity and well understood as arising due to quantum interference on self-intersecting diffusive trajectories. We have found that in graphene this weak-localization magnetoresistance is strongly suppressed and, in some cases, completely absent. The unexpected observation is attributed to mesoscopic corrugations of graphene sheets which can cause a dephasing effect similar to that of a random magnetic field.
低场磁阻在具有高电阻率的低维金属系统中普遍存在，并且由于自相交扩散轨迹上的量子干涉而被很好地理解。我们发现，在石墨烯中，这种弱局域磁阻被强烈抑制，在某些情况下甚至完全不存在。这一意外观察结果归因于石墨烯片的介观波纹，其可导致类似于随机磁场的退相效应。
