Vacuum and Surface Science
Online ISSN : 2433-5843
Print ISSN : 2433-5835
Special Feature : Transactions of the Annual Meeting on the Japan Society of Vacuum and Surface Science 2019[III]
Uniaxially Incommensurate Structure and Metal-insulator Transition of Metallic Indium Monolayer on Si(111)
Shigemi TERAKAWAShinichiro HATTAHiroshi OKUYAMATetsuya ARUGA
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2020 Volume 63 Issue 8 Pages 425-430


We have studied the atomic structure and phase transition of a monolayer phase of In on Si(111), known as the hexagonal (√7×√3) phase. Low-energy electron diffraction and scanning tunneling microscopy observations revealed that the monolayer phase actually has an incommensurate structure with the In overlayer uniaxially contracted by 2% from (√7×√3). We observed the phase transition to the (√7×√7) phase at 250–210 K upon cooling. Angle-resolved photoelectron spectroscopy and in situ four-point-probe conductivity measurements demonstrated that the transition induces disappearance of the metallic surface states and a sharp drop in conductivity, respectively. These results indicate an electronic metal-insulator transition.

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この記事はクリエイティブ・コモンズ [表示 - 非営利 4.0 国際]ライセンスの下に提供されています。
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