Si(111)表面上のIn単原子層金属の一軸性不整合構造と金属絶縁体転移

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タイトル別名
  • Uniaxially Incommensurate Structure and Metal-insulator Transition of Metallic Indium Monolayer on Si(111)
  • Si(111)ヒョウメン ジョウ ノ Inタンゲンシソウ キンゾク ノ イチジクセイ フセイゴウ コウゾウ ト キンゾク ゼツエンタイ テンイ

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抄録

<p>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.</p>

収録刊行物

  • 表面と真空

    表面と真空 63 (8), 425-430, 2020-08-10

    公益社団法人 日本表面真空学会

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