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CONCERTED MOTION OF Ge ADATOMS ON THE MODERATE TEMPERATURE PHASE OF THE Ge(111) SURFACE

GAI ZHENG HE YI YANG WEI-SHENG

CONCERTED MOTION OF Ge ADATOMS ON THE MODERATE TEMPERATURE PHASE OF THE Ge(111) SURFACE

GAI ZHENG, HE YI, YANG WEI-SHENG
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  • Received Date:  15 June 1995
  • Published Online:  05 April 1996

CONCERTED MOTION OF Ge ADATOMS ON THE MODERATE TEMPERATURE PHASE OF THE Ge(111) SURFACE

  • 1. 北京大学物理系人工微结构和介观物理国家重点实验室,北京100871

Abstract: In the present paper the moderate temperature (MT) phase of the Ge(111) surface, which was obtained by quenching the Ge(111) sample from about 300 1C to room temperature, has been studied by means of ultra-high-vacuum scanning tunneling microscopy (STM) . It has been found that in addition to diffusion of individual Ge adatoms, the most prominent feature of the MT phase is the concerted motion of Ge adatoms along the walls of the 2×2 domains. The moving adatoms may form either open strings or closed loops. Such concerted motion of Ge adatoms on the Ge(111) surface was predicted previously and has been of much theoretical interests, recently. However, this is the first experimental observation of such motion. Our study shows that the motion is not a result of STM tip interference and that it is always along the directions. On the basis of our STM observations as well as the results of the recent theoretical works some discussions on the characteristics of the concerted motion are given.

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