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LUMO photoemission lineshape in quasi-one-dimensional C_(60) chains

机译:一维C_(60)链中的LUMO光发射线形

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摘要

The low-energy single-particle excitations of highly ordered C_(60) chains adsorbed on a vicinal copper substrate are investigated by angle-resolved photoemission spectroscopy. The interface state previously identified on C_(60)/Cu(111) shows a one-dimensional dispersion on Cu(553). In contrast, no significant momentum dependence is detected for emission from the lowest unoccupied molecular orbital (LUMO). The LUMO displays similar phonon features as in C_(60)/Cu(111) but it does not peak toward the Fermi level for all considered potassium dopings and its photoemission lineshape is broader than in any other monolayer system investigated so far. This behavior is not easily reconciled with existing theory and indicates that the one-dimensional character of the chains affects the electronic structure of the monolayer in an intricate way.
机译:通过角分辨光发射光谱法研究了在邻域铜基底上吸附的高阶C_(60)链的低能单粒子激发。先前在C_(60)/ Cu(111)上确定的界面状态显示在Cu(553)上的一维色散。相反,未检测到最低的未占用分子轨道(LUMO)的发射具有明显的动量依赖性。 LUMO显示出与C_(60)/ Cu(111)类似的声子特征,但对于所有考虑的钾掺杂,它都未达到费米能级峰,并且其光发射线形比迄今研究的任何其他单层系统更宽。这种行为不容易与现有理论相吻合,并表明链的一维特征以复杂的方式影响单层的电子结构。

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  • 来源
    《Physical review》 |2010年第4期|045423.1-045423.6|共6页
  • 作者单位

    Physik Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

    Department of Applied Physics, Stanford University, Stanford, California 94305, USA;

    rnPhysik Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland Centre d'Investigacio en Nanociencia i Nanotecnologia (CIN2), CSIC-ICN, Esfera UAB, Campus de la UAB, 08193-Bellaterra, Spain;

    rnPhysik Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

    rnPhysik Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

    rnPhysik Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

    rnPhysik Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

    rnSwiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland;

    Department of Applied Physics, Stanford University, Stanford, California 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road,Menlo Park, California 94025, USA;

    rnPhysik Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

    rnPhysik Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

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  • 正文语种 eng
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  • 关键词

    fullerenes and related materials; intercalation compounds; polarons and electron-phonon interactions; photoemission and photoelectron spectra; effects of atomic and molecular interactions on electronic structure;

    机译:富勒烯及相关物质;插层化合物;极化子和电子-声子相互作用;光发射和光电子光谱;原子和分子相互作用对电子结构的影响;

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