Phase Locking and Soliton Dynamics of Charge Density Waves on a Silicon Surface

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  • シリコン表面上での電荷密度波の格子整合効果とソリトンダイナミクス
  • シリコン ヒョウメン ジョウ デ ノ デンカ ミツドハ ノ コウシ セイゴウ コウカ ト ソリトンダイナミクス

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Abstract

A periodic array of metallic In atomic chains on a Si(111) surface, 4×1-In superstructure, has been investigated by angule-resolved photoemission spectroscopy (ARPES) at room temperature and 100 K, and by scanning tunneling microscopy (STM) at 6 K. We have found from ARPES measurements a one-dimensional metallic band folding back at 100 K and leaving an energy gap at Fermi level. This leads to a metal-to-insulator phase transition and thus supports the charge-density-wave (CDW) model rather than an order-disorder model for the 4×1 (room temperature) to 8×'2' (low temperature) phase transition. We also have found a CDW-lattice locking effect from STM observation at 6 K, that is a lack of one-to-one correspondence between the filled- and empty-state images. The effect is interpreted that the CDW is pinned on the frozen lattice in two different ways. Furthermore, dynamics of a highly movable soliton in the CDW has been observed, which is a characteristic of this kind of quasi-one-dimensional systems.

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 25 (7), 407-415, 2004

    The Surface Science Society of Japan

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