Single germanene phase formed by segregation through Al(111) thin films on Ge(111)

Single germanene phase formed by segregation through Al(111) thin films on Ge(111)
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通过 Ge(111) 上的 Al(111) 薄膜偏析形成单锗烯相

DOI:
10.1088/2053-1583/ac2bef
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发表时间:
2021
期刊:
影响因子:
5.5
通讯作者:
Lay Guy Le
Lay Guy Le
中科院分区:
材料科学2区
文献类型:
--
作者:
Yuhara Junji;Muto Hiroaki;Araidai Masaaki;Kobayashi Masato;Ohta Akio;Miyazaki Seiichi;Takakura Sho-ichi;Nakatake Masashi;Lay Guy Le

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我们用原子分离外延法在锗(111)模板上生长了单相单层锗烯/铝(111)薄膜,这种制备方法不同于以往工作中使用的分子束外延法。在430 ℃退火时,可大面积制备出与Al(111)3× 3超晶胞相匹配的2× 2重建锗烯相。利用扫描隧道显微镜(STM),低能电子衍射,俄歇电子能谱和同步辐射光电子能谱进行了详细的研究。基于密度泛函理论的第一性原理计算沿着原子尺度的STM图像揭示了每个2× 2锗烯超晶胞中有一个突出的Ge原子和一个特征色散带,该色散带起源于锗烯片层,与下面的第一层Al原子轻微耦合。相反,在较低温度下退火时,多相区包含扭曲的锗烯畴,与先前研究中获得的Al(111)x7 x7 x7 R±19.1超结构相对应。
We have obtained single phase monolayer germanene on aluminum (111) thin films grown on a germanium (111) template by atomic segregation epitaxy, a preparation method differing from molecular beam epitaxy used in previous works. This 2× 2 reconstructed germanene phase matching an Al (111) 3× 3 supercell has been prepared in large areas upon annealing at 430 C. Detailed studies have been carried out using scanning tunneling microscopy (STM), low-energy electron diffraction, Auger electron spectroscopy, and synchrotron radiation photoemission spectroscopy. First-principles calculations based on the density function theory along with atomic-scale STM images reveal the atomic structure with one protruding Ge atom per 2× 2 germanene supercell and a characteristic dispersing band originating from the germanene sheet slightly coupled to the first layer Al atoms underneath. Instead, upon annealing at lower temperatures, multi-phase regions comprise twisted germanene domains in correspondence with an Al (111)√ 7×√ 7 R±19.1 superstructure as obtained in previous studies.
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利用 Al/Ge(111) 结构中发生的表面偏析形成超薄 Ge 晶体
DOI: --
发表时间: 2019
期刊:
影响因子: --
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