论文标题
石墨烯中单个单场引起的间隔散射的表征和操纵
Characterization and manipulation of intervalley scattering induced by an individual monovacancy in graphene
论文作者
论文摘要
Intervalley散射涉及微观过程，即电子在纳米长度尺度上被原子尺度缺陷散射。尽管我们对材料的电子特性的理解至关重要，但直到迄今为止，由个体原子缺陷引起的间隔散射的范围和强度的直接表征和操纵是难以捉摸的。使用扫描隧道显微镜，我们从石墨烯中的单个单场进行了可视化和受控的间隔散射。通过直接对单程术的间隔散射范围进行成像，我们证明了它与能量成反比，即它与无质量的dirac fermions的波长成正比。观察到间隔散射的巨型电子孔不对称，因为单程充电。通过进一步充电单轮廓，绕着单进的弯曲电子电位软化了散射电位，因此，这抑制了单场的间隔散射。
Intervalley scattering involves microscopic processes that electrons are scattered by atomic-scale defects on nanometer length scales. Although central to our understanding of electronic properties of materials, direct characterization and manipulation of range and strength of the intervalley scattering induced by an individual atomic defect have so far been elusive. Using scanning tunneling microscope, we visualized and controlled intervalley scattering from an individual monovacancy in graphene. By directly imaging the affected range of intervalley scattering of the monovacancy, we demonstrated that it is inversely proportional to the energy, i.e., it is proportional to the wavelength of massless Dirac Fermions. A giant electron-hole asymmetry of the intervalley scattering is observed because that the monovacancy is charged. By further charging the monovacancy, the bended electronic potential around the monovacancy softened the scattering potential, which, consequently, suppressed the intervalley scattering of the monovacancy.
