Real-time observation of the Si(111):(7×7)−(1×1) phase transition by scanning tunneling microscopy
作者： K. Miki , Y. Morita , H. Tokumoto , T. Sato , M. Iwatsuki
DOI: 10.1016/0304-3991(92)90368-T
关键词: Step edges 、 Scanning tunneling microscope 、 Semiconductor materials 、 Optics 、 Condensed matter physics 、 Transition temperature 、 Silicon 、 Chemistry 、 Surface (mathematics) 、 Equilateral triangle 、 Phase transition
摘要: Abstract The initial stage of the (1×1)−(7×7) phase transition Si(111) surface was directly observed by scanning tunneling microscopy. On cooling down to a temperature Tc, (7×7) domain nucleated from step edges and expanded towards inner region terraces continuously, steps became straight [ 1 2] steps. domains took shapes triangles with acute top angles fluctuated in size around Tc. sizes were more than 6 units on terraces. Based free-energy considerations just at Tc as well energy difference between faulted unfaulted units, we have found that real are equilateral which surrounded there exists critical below disappear rapidly.
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