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Inelastic scattering in a monolayer graphene sheet: A weak-localization study

机译:单层石墨烯片中的非弹性散射:弱定位研究

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Charge carriers in a graphene sheet, a single layer of graphite, exhibit distinct characteristics from those in other two-dimensional electronic systems because of their chiral nature. In this paper, we focus on the observation of weak localization in a graphene sheet exfoliated from a piece of natural graphite and nanopatterned into a Hall-bar geometry. Much stronger chiral-symmetry-breaking elastic intervalley scattering in our graphene sheet restores the conventional weak localization. The resulting carrier density and temperature dependence of the phase coherence length reveal that the electron-electron interaction including a direct Coulomb interaction is the main inelastic-scattering factor while electron-hole puddles enhance the inelastic scattering near the Dirac point.
机译:石墨烯片(单层石墨)中的电荷载体由于具有手性,因此与其他二维电子系统具有不同的特性。在本文中,我们专注于观察从一块天然石墨剥落并纳米化为霍尔棒几何形状的石墨烯片中的弱局部化现象。在我们的石墨烯片中,更强的打破手性对称性的弹性间隔断裂散射恢复了常规的弱局部化。所得的载流子密度和相干长度的温度依赖性表明,包括直接库仑相互作用在内的电子-电子相互作用是主要的非弹性散射因子,而电子-空穴水坑增强了狄拉克点附近的非弹性散射。

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