Coupling of kz-dispersing π bands with surface localized states in graphit
Coupling of kz-dispersing π bands with surface localized states in graphit
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kz 色散 π 带与石墨表面局域态的耦合
DOI：
10.1103/physrevb.105.235126
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发表时间：
2022
影响因子：
3.7
通讯作者：
Suga Shigemasa
中科院分区：
文献类型：
--
作者：
Matsui Fumihiko;Suga Shigemasa
通过光电子动量显微镜测量了几微米尺寸区域的石墨分散体。研究了整个布里渊区的能带色散。我们发现在ALH倒晶面中能带的简并性被消除，并且它们的对称性从 到 降低。我们将这种现象归因于单域三重结构的石墨表面带与迄今为止被忽视的六重体色散的耦合。我们利用这种对称性破缺来对石墨表面的单原子台阶进行成像。此外，还讨论了色散测定的精度和表面共振的影响。
The graphitedispersion from the region with a size of several micrometers was measured via photoelectron momentum microscopy. The-band dispersion over an entire Brillouin zone was investigated. We found that the degeneracy of thebands was eliminated in the ALH reciprocal lattice plane and their symmetries were reduced fromto. We attributed this phenomenon to the coupling of the graphite surfaceband of a single-domain threefold structure with the sixfold bulkdispersion which has been neglected to date. We used this symmetry breaking to image the monoatomic step of the graphite surface. Further, the precision of determiningdispersion and the effect of surface resonance are discussed.