Adsorbate-Induced Pinning of a Charge-Density Wave in a Quasi-1D Metallic Chains: Na on theIn/Si(111)−(4×1)Surface Academic Article uri icon

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  • We find that foreign adsorbates acting as local impurities can induce a metal-insulator transition by pinning a charge-density wave (CDW) on the quasi-1D metallic In/Si(111)-(4x1) chain system. Our scanning tunneling microscopy image clearly reveals the presence of a new local 4x2 structure nucleated by Na adatoms at room temperature, which turns out to be insulating with a doubled periodicity along the chains. We directly determine a CDW gap energy Delta = 105+/-8 meV by identifying a characteristic loss peak in our high-resolution electron-energy-loss spectra. We thus report the first observation of a local impurity-derived Peierls-like reconstruction of a quasi-1D system.


  • Lee, Sung-sik
  • Ahn, JR
  • Kim, ND
  • Min, JH
  • Hwang, CG
  • Chung, JW
  • Yeom, HW
  • Ryjkov, Serguei V
  • Hasegawa, Shuji

publication date

  • May 13, 2002