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arXiv 2007.11962cond-mat.mtrl-sci
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Au(111)表面单层V $_{2}$ S $_{3}$中莫尔效应引起的电子结构变化

Moiré induced electronic structure modifications in monolayer V$_{2}$S$_{3}$ on Au(111)

Umut Kamber, Sahar Pakdel, Raluca-Maria Stan, Anand Kamlapure, Brian Kiraly, Fabian Arnold, Andreas Eich, Arlette S. Ngankeu, Marco Bianchi, Jill A. Miwa, Charl… 展开作者

Umut Kamber, Sahar Pakdel, Raluca-Maria Stan, Anand Kamlapure, Brian Kiraly, Fabian Arnold, Andreas Eich, Arlette S. Ngankeu, Marco Bianchi, Jill A. Miwa, Charlotte E. Sanders, Nicola Lanatà, Philip Hofmann, Alexander A. Khajetoorians

摘要:

人们对局部环境如何影响单层极限下材料的电子结构有着极大的兴趣。利用低温扫描隧道显微镜和光谱仪研究了Au(111)衬底上原位生长单层V2 S3薄膜电子结构的莫尔效应.我们观察到的集成局域态密度(LDOS)的长程调制,并量化这种调制相对于莫尔超结构的多个取向的单层相对于衬底。扫描隧道光谱揭示了LDOS中的一个突出峰,其在莫尔超结构的不同点处的能量发生了偏移。比较从头计算与角分辨光电发射,我们能够属性这个峰值的频带,表现出一个大的平面外d-轨道字符。这表明莫尔条纹驱动的测量态密度的变化是由单层-衬底杂化的周期性调制驱动的。

英文摘要:

There is immense interest in how the local environment influences the electronic structure of materials at the single layer limit. We characterize moiré induced spatial variations in the electronic structure of in-situ grown monolayer V2S3 on Au(111) by means of low temperature scanning tunneling microscopy and spectroscopy. We observe a long-range modulation of the integrated local density of states (LDOS), and quantify this modulation with respect to the moiré superstructure for multiple orientations of the monolayer with respect to the substrate. Scanning tunneling spectroscopy reveals a prominent peak in the LDOS, which is shifted in energy at different points of the moiré superstructure. Comparing ab initio calculations with angle-resolved photoemission, we are able to attribute this peak to bands that exhibit a large out-of-plane d-orbital character. This suggests that the moiré driven variations in the measured density of states is driven by a periodic modulation of the monolayer-substrate hybridization.

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