title: Adsorbate-induced pinning of a charge-density wave in a quasi-1D metallic chains: Na on the In/Si(111)-(4x1) surface.
abstract: 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.
authors: Physics Department and Basic Science Research Institute, Pohang University of Science and Technology, San 31 Hyoja Dong, Pohang 790-784, Korea.
authors: S S
authors: SS
authors: Lee
authors: J R
authors: JR
authors: Ahn
authors: N D
authors: ND
authors: Kim
authors: J H
authors: JH
authors: Min
authors: C G
authors: CG
authors: Hwang
authors: J W
authors: JW
authors: Chung
authors: H W
authors: HW
authors: Yeom
authors: Serguei V
authors: SV
authors: Ryjkov
authors: Shuji
authors: S
authors: Hasegawa