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Dispersive resonance bands within the space-charge layer of a metal-semiconductor junction

机译:金属-半导体结的空间电荷层内的色散共振带

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摘要

Based on measurements of angle-resolved photoemission, we report that in the Pb/Ge(111)-3~(1/2) × 3~(1/2) R30° structure, in addition to three bands resembling Ge heavy hole (HH), light hole (LH), and split off (SO) bulk band edges, a fourth dispersive band resembling the nonsplit off (NSO) band is found near the surface zone center. While three Ge bulklike bands get distorted due to strong coupling between Pb and Ge, the NSO-like band gets weaker and disappears for larger thickness of Pb, which, when combined with ab initio calculations, indicates its localized nature within space-charge layer. Our results are clearly important for designing electronics involved with metal-semiconductor contacts.
机译:根据角度分辨光发射的测量结果,我们报告说在Pb / Ge(111)-3〜(1/2)×3〜(1/2)R30°结构中,除了三个类似于Ge重孔的能带( HH),光孔(LH)和分离(SO)体能带边缘,在表面区域中心附近发现了类似于非分离(NSO)能带的第四色散能带。尽管由于Pb和Ge之间的强耦合而使三个Ge块状能带发生畸变,但随着Pb厚度的增加,NSO状能带变得更弱并消失,这与从头算计算相结合,表明其在空间电荷层内的局限性。我们的结果对于设计涉及金属-半导体触点的电子产品显然很重要。

著录项

  • 来源
    《Physical review》 |2010年第24期|P.245406.1-245406.5|共5页
  • 作者单位

    Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan;

    rnDepartment of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan;

    rnDepartment of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan;

    National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan;

    rnNational Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan;

    rnNational Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan;

    rnInstitute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan;

    rnDepartment of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan Physics Division, National Center for Theoretical Sciences, P.O. Box 2-131, Hsinchu, Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    surface states, band structure, electron density of states; quantum wells; adsorbed layers and thin films;

    机译:表面态;能带结构;态电子密度;量子阱吸附层和薄膜;

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