多层外延石墨烯中量子霍尔效应的猝灭及非掺杂面的作用
Quenching of quantum Hall effect and the role of undoped planes in multilayered epitaxial graphene
摘要：
我们提出了一种机制，淬火的Shubnikov de Haas振荡和量子霍尔效应中观察到的外延石墨烯。实验数据表明，传导电子的散射时间与磁场有关，与回旋轨道周期数量级有关，\textit{i.e.}可以比零场散射时间小得多。我们的方案涉及到不带电层的非凡石墨烯$n=0$朗道能级，它在费米能级产生高密度的态。我们发现，这个$n=0$朗道水平和掺杂平面的导电状态之间的耦合导致具有正确的幅度来解释实验数据的散射机制。
英文摘要：
We propose a mechanism for the quenching of the Shubnikov de Haas oscillations and the quantum Hall effect observed in epitaxial graphene. Experimental data show that the scattering time of the conduction electron is magnetic field dependent and of the order of the cyclotron orbit period, \textit{i.e.} can be much smaller than the zero field scattering time. Our scenario involves the extraordinary graphene $n=0$ Landau level of the uncharged layers that produces a high density of states at the Fermi level. We find that the coupling between this $n=0$ Landau level and the conducting states of the doped plane leads to a scattering mechanism having the right magnitude to explain the experimental data.
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