Au（111）的重构诱导三叶结费米轮廓
Reconstruction-induced trefoil knot Fermi contour of Au(111)
摘要：
利用角分辨光电子能谱（ARPES）研究了Au（111）的人字形重构对类自由电子表面态色散的影响。虽然早期的ARPES调查只报告了一个轻微的相互作用的表面状态的色散和底层的重建，我们表明，单轴晶格畸变，从而改变了第一原子层的倒易晶格导致不同的表面状态色散周围的第一顺序倒易晶格点的三个域，创建一个恒定的能量表面类似三叶结。研究结果解决了长期存在的差异，一方面，重建引起的表面状态修改扫描隧道显微镜和第一性原理计算报告，另一方面，他们明显缺乏光电发射。
英文摘要：
Using angle-resolved photoemission spectroscopy (ARPES), we study the effect of the so-called herringbone reconstruction of Au(111) on the dispersion of the free electron-like surface state. While earlier ARPES investigations have only reported a minor interplay of the surface state dispersion and the underlying reconstruction, we show that the uniaxial lattice distortion and the thereby changed reciprocal lattice for the first atomic layer leads to distinct surface state dispersions around the first order reciprocal lattice points of the three domains, creating a constant energy surface resembling a trefoil knot. The findings resolve the long-standing discrepancy between, on one hand, the reconstruction-induced surface state modifications reported in scanning tunnelling microscopy and first principle calculations and, on the other hand, their conspicuous absence in photoemission.
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