Inelastic scattering in a monolayer graphene sheet: A weak-localization study
Inelastic scattering in a monolayer graphene sheet: A weak-localization study
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DOI：
10.1103/physrevb.78.125409
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发表时间：
2008-09-01
影响因子：
3.7
通讯作者：
Park, Kee-Su
中科院分区：
文献类型：
--
作者：
Ki, Dong-Keun;Jeong, Dongchan;Park, Kee-Su
石墨烯片（单层石墨）中的电荷载流子由于其手性性质而表现出与其他二维电子系统中的电荷载流子不同的特性。在本文中，我们专注于观察弱本地化的石墨烯片剥离从一块天然石墨和纳米图案成霍尔棒几何形状。我们的石墨烯片中更强的手征对称性破缺弹性谷间散射恢复了传统的弱局域化。由此产生的载流子密度和温度依赖性的相位相干长度揭示了电子-电子相互作用，包括直接库仑相互作用是主要的非弹性散射的因素，而电子-空穴水坑增强的狄拉克点附近的非弹性散射。
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.